OLYMPIA -- Four demonstrators were arrested Saturday at a pro-Trump rally in Olympia.

According to Washington State Patrol Sgt. James Prouty, the demonstrators were arrested for assaulting a police officer.

Several hundred people attended the rally at Heritage Park. A smaller group of anti-Trump demonstrators were also there.

Police said it was unclear if the arrested demonstrators were part of the anti-Trump or pro-Trump group.