Neb. Rev. Stat. § 14-221: Neb. Rev. Stat. § 14-221

It shall be the duty of the mayor of a city of the metropolitan class to:

(1) Enforce the laws of the state and the ordinances of the city;

(2) Order, direct, and enforce, through the officers of the police department, the arrest and prosecution of persons violating such laws and ordinances; and

(3) Cooperate with and assist the county sheriff in suppressing riots and mobs and in the arrest and prosecution of persons charged with crimes.