Fort Collins police ended up having to use tear gas to clear a street party, Saturday night.
Over three hundred people were partying near Colorado State University, when police arrived.
When police asked them to leave the crowd began to throw bottles, cans, and other objects at the officers.
They also began to climb onto cars, street lights, and trees.
Police called for back up and ended up using tear gas and pepper spray to disperse what had begun to become a mob.
Three party goers were treated for minor injuries and released, no officers were hurt.