Mo. Rev. Stat. § 521.140

The original writ of attachment shall be directed and delivered to the sheriff, or other officer authorized by law to serve the same, and shall command him to attach the lands, tenements, goods, chattels, rights, moneys, credits, evidences of debt and effects of the defendant, or so much thereof as will be sufficient to satisfy the plaintiff's claim, as sworn to, with interest and costs, and to summon as garnishees all persons in whose hands or possession any personal property, rights, credits, evidences of debt, effects or money of the defendant may be, or who may be named by the plaintiff or his attorney as garnishees. When the action is commenced by attachment, the writ shall further contain a summons to the defendant, of the nature and effect of an ordinary summons, to appear and answer the action of the plaintiff.