18 Pa.C.S. § 5501: Riot.

A person is guilty of riot, a felony of the third degree, if he participates with two or more others in a course of disorderly conduct:

(1) with intent to commit or facilitate the commission of a felony or misdemeanor;

(2) with intent to prevent or coerce official action; or

(3) when the actor or any other participant to the knowledge of the actor uses or plans to use a firearm or other deadly weapon.