Minn. Stat. § 629.30
Subd. 1. Definition.
Arrest means taking a person into custody that the person may be held to answer for a public offense. "Arrest" includes actually restraining a person or taking into custody a person who submits.
Subd. 2. Who may arrest.
An arrest may be made:
(4) by a private person.
A private person shall aid a peace officer in executing a warrant when requested to do so by the officer.