Minn. Stat. § 629.37: WHEN PRIVATE PERSON MAY MAKE ARREST.

A private person may arrest another:

(1) for a public offense committed or attempted in the arresting person's presence;

(2) when the person arrested has committed a felony, although not in the arresting person's presence; or

(3) when a felony has in fact been committed, and the arresting person has reasonable cause for believing the person arrested to have committed it.