¶1Leominster police officer Thomas Kent was shot *29and seriously wounded on September 15, 1995, by John J. Mac-Neil, a convicted murderer who had been serving a life sentence in the Massachusetts prison system until his parole in 1987. Kent and his wife and three children brought suit under the Massachusetts Tort Claims Act, G. L. c. 258, against the Commonwealth and the Massachusetts Parole Board, alleging that the defendants were grossly negligent in 1987 when they released MacNeil by paroling him to the custody of the Immigration and Naturalization Service (INS) for deportation to Canada, and that their mishandling of MacNeilâs case persisted in 1995, when they failed to reestablish parole jurisdiction over him after learning that he had returned to the United States and was released from Federal custody. These acts and omissions, say the plaintiffs, foreseeably resulted in the shooting of Thomas Kent.
¶2The case is before us on the defendantsâ appeal from the denial of their motion to dismiss, taken in reliance upon the doctrine of present execution. We affirm.
¶31. The complaint. The facts alleged by the plaintiffs may be summarized as follows. In 1969, MacNeil was sentenced to life in prison on two counts of murder,
¶4MacNeil was denied parole when he first became eligible in 1985 and again in 1986. In its denial dated July 14, 1986, the full parole board noted that MacNeil was still in maximum security and that he lacked a pre-release plan and a solid record of accomplishment while incarcerated. However, even though these circumstances remained unchanged, on January 22, 1987, a panel of the parole board recommended that MacNeil be paroled to a deportation warrant. On April 6, 1987, the parole board paroled MacNeil to the custody of the INS for deporta*30tion to Canada, with only two conditions: that he report by mail to the Massachusetts Parole Board, on a quarterly basis and that he not return to the United States. On April 28, 1987, he was deported to Canada.
¶5MacNeil returned to the United States, and was arrested on September 11, 1987, for violating parole. However, on January 14, 1988, a judge of the Superior Court ruled that by paroling MacNeil to the INS rather than to Canadian authorities under G. L. c. 127, § 97B, the parole board had surrendered MacNeil to the authority of the INS and had lost jurisdiction over him. As a result of this ruling, MacNeil was released from State custody and transferred to the INS, which deported him to Canada a second time.
¶6Again, MacNeil returned to the United States. He was taken into custody by the INS on July 12, 1994, and denied bail. However, he was released less than a year later, on June 7, 1995, after it was determined that he was, in fact, a United States citizen. Two days later, he had another skirmish with the law and was arraigned in West Roxbury District Court for having violated a restraining order that his wife had obtained against him. Initially denied release, MacNeil eventually was allowed back on the streets.
¶7On or about June 9, 1995, the parole board decided to attempt to regain custody over MacNeil, but it did nothing to reassert jurisdiction over him before he shot Officer Kent on September 15, 1995. On that day, Kent and his partner responded to a call regarding a suspicious person at a private residence in Leominster. When the officers arrived on the scene, MacNeil emerged from the garage of the residence, firing two guns. Kent was struck in the chest but was able to return fire and kill MacNeil.
¶82. The defendantsâ motion. The defendants challenge the complaint on two grounds. The first ground, lack of proximate causation, is directed at the complaint as a whole. The defendants argue that, as matter of law, events occurring after MacNeilâs parole in 1987 broke any chain of causation and ended any duty of care on their part. The second ground, immunity from suit, is asserted only insofar as the plaintiffsâ claims are based upon the defendantsâ failure to reestablish parole *31jurisdiction over MacNeil in 1995. The defendants rely upon the so-called statutory public duty rule, G. L. c. 258, § 10(/), as recently interpreted by the Supreme Judicial Court in Brum v. Dartmouth', King v. Commonwealth, 428 Mass. 684, 692-696 (1999), for the proposition that they are immune from claims of âfailure to actâ unless the plaintiffs also can prove that the defendantsâ affirmative conduct âoriginally causedâ the condition or situation which led to the harm.
¶93. Appropriateness of review. We first consider whether this appeal is properly before us. Ordinarily, the denial of a motion to dismiss is not an appealable order. See Bean v. 399 Boylston St., Inc., 335 Mass. 595, 596 (1957); Rollins Envtl. Servs., Inc. v. Superior Ct., 368 Mass. 174, 178 (1975). One of the exceptions to this rule is the doctrine of present execution, upon which the defendants rely.
¶10The doctrine of present execution is a limited exception to the finality rule which permits immediate appeal of an interlocutory order if the order will interfere with rights in a way that cannot be remedied on appeal from the final judgment, and it involves issues collateral to any remaining controversy. See *32Borman v. Borman, 378 Mass. 775, 780-782 (1988); Maddocks v. Ricker, 403 Mass. 592, 597-600 (1988). Interlocutory orders addressing a defendantâs immunity from suit may fall within the ambit of the doctrine of present execution. Breault v. Chairman of Bd. of Fire Commrs. of Springfield, 401 Mass. 26, 31 (1987), cert, denied sub nom. Forastiere v. Breault, 485 U.S. 906 (1988); Duarte v. Healy, 405 Mass. 43, 44 n.2 (1989); Hopper v. Callahan, 408 Mass. 621, 623-624 (1990); Brum v. Dartmouth; King v. Commonwealth, 428 Mass. at 687-688. However, because the inquiry into the existence of immunity is often fact-dependent and may be elucidated by discovery, interlocutory appeals from rulings on immunity typically have arisen in the context of an appeal from the denial of a motion for summary judgment. See Breault, supra; Duarte, supra;Hopper, supra. See also Matthews v. Rakiey, 38 Mass. App. Ct. 490, 493 (1995) (appeal taken from denial of âmotion for qualified immunityâ filed in civil rights case after discovery). Still, in an appropriate case, an interlocutory appeal raising immunity from suit also may proceed after the denial of a motion to dismiss, as illustrated by the Supreme Judicial Courtâs consolidated opinion in Brum v. Dartmouth; King v. Commonwealth, 428 Mass. at 687-688, where the court emphasized the importance of early consideration of immunity issues.
¶11The defendants here rely heavily upon Brum-King, not only as to the question of appealability, but also, as discussed below, with respect to their substantive contentions. In Brum-King, the Commonwealth moved to dismiss a wrongful death claim that alleged that an assistant district attorney was grossly negligent in agreeing to the release on personal recognizance of a criminal defendant who later shot and killed the Brum-King plaintiffâs decedent. The Commonwealth sought dismissal of the entire case on the ground that it was immune from suit under G. L. c. 258, § 10(6) and (/'), and took an immediate appeal when its motion to dismiss was denied by the lower court. Id. at 686. The Supreme Judicial Court entertained the appeal under the doctrine of present execution, observing that immediate appeal, if successful, would effectuate one of the primary objectives of Tort Claims Act immunity from suit, that being the protection of public defendants from the disruption of litigation. Ibid.
¶12*33Although the court ultimately dismissed the case for lack of proximate causation and did not decide the immunity issues, it emphasized that taking this different tack did not deprive it of jurisdiction to decide the appeal. Ibid. However, by deciding the case on non-immunity grounds, the court was not called upon to evaluate whether the facts were sufficiently developed at the motion to dismiss stage to permit the reasoned application of § 10(6) and (j). We therefore do not read Brum-King to mean that an immediate appeal from the denial of a motion to dismiss advanced on immunity grounds invariably is appropriate or desirable.
¶13In any event, Brum-King made a stronger case for permitting an interlocutory appeal from the denial of a motion to dismiss than does the present case. Because the Commonwealthâs immunity defenses in Brum-King would have disposed of the entire case had they been reached, immediate review of these issues had the potential to relieve the public defendants from having to defend the case at all. Id. at 688-689. Here, on the other hand, the defendantsâ immunity defense is directed at only one aspect of the plaintiffsâ claims â the defendantsâ alleged failure to reassert parole jurisdiction over MacNeil in 1995; and the immunity issue which is presented, namely whether the parole boardâs release of MacNeil in 1987 is too remote to serve as an affirmative act within the meaning of the exception contained in § 10(f), involves the same factual considerations that infuse the remainder of the case. Consequently, the immunity issue here is neither dispositive of the case as a whole, nor collateral to the rest of the controversy as required by the doctrine of present execution. See R.J.A. v. K.A.V., 34 Mass. App. Ct. 369, 374 (1993) (issue âinextricably intertwinedâ with ultimate matters to be decided is not collateral and not appeal-able under doctrine of present execution).
¶14Furthermore, even if the doctrine of present execution properly could be invoked, it still would have been preferable to delay any interlocutory appeal of the immunity issue until the trial court had the opportunity to assess the significance of the 1995 allegations on a more expansive record. It is not clear from the face of the complaint alone that the allegations relating to events in 1995 do, in fact, comprise a separate claim that *34is susceptible of separate dismissal. The 1995 allegations are not contained in a separate count and may have been included merely to illustrate that the defendantsâ conduct, throughout the MacNeil affair, went beyond simple negligence. See Pruzynski v. Malinowski, 338 Mass. 58, 60 (1958) (gross negligence may be found if the defendant persisted in a clearly negligent course of conduct over an appreciable period of time). Accordingly, review of the immunity issue, not to mention the defendantsâ other ground for dismissal, would have been better deferred until the plaintiffsâ claims and supporting facts were further developed.
¶154. The denial of the motion. Because the parties have briefed the issues thoroughly, we exercise our discretion to address the defendantsâ contentions, concluding that the motion was properly denied. Our review is conducted âin light of the principles that (a) the allegations in the complaint, as well as such reasonable inferences as may be drawn therefrom in favor of [the plaintiffs], are to be taken as true, and (b) a complaint is sufficient âunless it appears beyond doubt that the plaintiff can prove no set of facts in support of his claim which would entitle him to relief.â â Eyal v. Helen Bdcst. Corp., 411 Mass. 426, 429 (1991) (citations omitted). See Nader v. Citron, 372 Mass. 96, 98 (1977). We emphasize that this is an indulgent standard and that we address only the asserted grounds for dismissal.
¶16The plaintiffsâ primary theory of recovery is that the defendants acted with gross negligence in releasing MacNeil in 1987 and in doing so by paroling him to the INS for deportation rather than in a manner that would have allowed the parole board to retain jurisdiction over him until the expiration of his term of imprisonment as required by G. L. c. 127, § 130.
¶17The defendants assume, for purposes of their motion, that the plaintiffs have stated a claim for gross negligence and that the *35claim therefore falls within the exception to immunity that is contained in G.L. c. 258, § 10(f)-
¶18The defendants again analogize to Brum-King where it was held, as matter of law, that there was no proximate causation between the prosecutorâs recommendation concerning bail and the killing of the plaintiffâs decedent, because the power to release resided in the hands of the judicial officer who ordered the release, and not the prosecutor. Brum v. Dartmouth, King v. Commonwealth, 428 Mass. at 689. In this case, however, the parole board had the independent power to release MacNeil, and it exercised that power. Thus, no chain of causation is required to link the conduct of the defendants with the release itself. Furthermore, we cannot conclude at this juncture that there is no set of facts which, if proved, would allow a trier of fact to find that the Superior Courtâs ruling was a logical and foreseeable consequence of the allegedly grossly negligent manner in which MacNeilâs release was effectuated. Accordingly, the complaint cannot be dismissed on the ground that the Superior Court ruling was a superseding, intervening event as matter of law. See Mullins v. Pine Manor College, 389 Mass. 47, 62-63 (1983); Copithorne v. Framingham Union Hosp., 401 Mass. 860, 862 (1988); Restatement (Second) of Torts § 442 (1965) (listing factors to consider in determining if an intervening force is a superseding cause, including whether it operated *36independently of any situation created by the actorâs negligence).
¶19Nor can we conclude that other intervening events, such as MacNeilâs return to the United States, broke the chain of causation as matter of law. Again, the touchstone of liability will be foreseeability. âThe test is to be found in the probable injurious consequences which were to be anticipated, not in the number of subsequent events and agencies which might arise.â Jesionek v. Massachusetts Port Authy., 376 Mass. 101, 105, (1978), quoting from Lane v. Atlantic Works, 111 Mass. 136, 139-140 (1872). Because the issue is presented to us on a motion to dismiss, we have no factual record on such potentially relevant considerations as the extent of the parole boardâs knowledge or reason to know of MacNeilâs personal circumstances, his ties to the United States, and the predictability of his return. Although it may be that the plaintiffs will find it difficult to establish that the 1995 shooting was a foreseeable consequence of the parole boardâs acts or omissions, that is a factual determination which cannot be resolved on the basis of the complaint alone. See Coughlin v. Department of Correction, 43 Mass. App. Ct. 809, 816 n.10 (1997).
¶20Similarly, assuming that the plaintiffsâ allegations with respect to the parole boardâs failure to return MacNeil to custody in 1995 are intended as a separate theory of recovery, it is premature to decide that this claim is not viable. The defendants are correct that G. L. c. 258, § 100), would immunize them from a claim for âfailure to actâ in 1995 unless the plaintiffs also proved that the defendantsâ affirmative behavior âoriginally causedâ the condition or situation which led to the harm. See Brum v. Dartmouth, King v. Commonwealth, 428 Mass. at 692-696, citing Bonnie W. v. Commonwealth, 419 Mass. 122, 125 (1994). However, whether or not the release of MacNeil in 1987 is too âremoteâ to constitute such an affirmative act involves the same factual considerations as the issue of *37proximate causation. Again, this is a question inappropriate to decide at this embryonic stage of the case.
¶21The order denying the defendantsâ motion to dismiss is affirmed.
¶22So ordered.
¶23 Although the complaint does not so state, it is represented and we assume that MacNeilâs convictions were for second degree murder.
¶24Section 10(j) provides, with enumerated exceptions not relevant here, that sovereign immunity is not waived under the Tort Claims Act as to âany claim based on an act or failure to act to prevent or diminish the harmful consequences of a condition or situation, including the violent or tortious conduct of a third person, which is not originally caused by the public employer or any other person acting on behalf of the public employer.â
¶25A third ground of dismissal, that the plaintiffsâ claims fell within G. L. c. 258, § 10(A), the âdiscretionary functionâ exception to Tort Claims Act liability, was abandoned by the defendants.
¶26Review may also be sought by petitioning a single justice of this court for leave to prosecute an interlocutory appeal from the denial of a motion to dismiss. See G. L. c. 231, § 118, first par.; Fairneny v. Savogran Co., 422 Mass. 469, 470 (1996), citing Leavitt v. Mizner, 404 Mass. 81, 87-88 (1989). However, the defendants did not do so here. Instead, they filed a notice of appeal claiming an appeal as of right under the authority of Brum v. Dartmouth; King v. Commonwealth, 428 Mass. at 687-688.
¶27We do not opine as to the nature and extent of the parole boardâs obligations under the statute.
¶28Section 10(i) provides that Tort Claims Act liability does not apply to any âclaim based upon the release, parole, furlough or escape of any person . . . from the custody of a public employee . . . unless gross negligence is shown in allowing such release, parole, furlough or escapeâ (emphasis supplied).
¶29On the limited record before us, we are in no position to consider, and our analysis does not turn on the correctness of, the Superior Courtâs determination that MacNeil was no longer subject to the jurisdiction of the parole board and could no longer be held in State custody. At this stage of the case, the plaintiffsâ allegations are sufficient to keep the issue of foreseeability alive.