Neb. Rev. Stat. § 19-647

The city manager may investigate at any time the affairs of any city department or the conduct of any officer or employee of the city. The city manager, or any person or persons appointed by him or her for such purpose, shall have the same power to compel the attendance of witnesses and the production of books and papers and other evidence, and to punish for contempt, granted to the city council pursuant to section 19-618 .