Police in Portland, Oregon, have ordered participants in a march by Patriot Prayer to disperse after officers saw assaults and projectiles being thrown.

Police said Saturday that some arrests have been made at the downtown protest involving immigration.

The problems occurred as two opposing protest groups — Patriot Prayer and antifa — took to the streets.

People were lighting firecrackers and smoke bombs in the crowd and police used flash bangs in an effort to disperse the clashing protesters.

Officers were searching for weapons and handcuffed at least two people.