Michigan ? Police used tear gas early Sunday to disperse a massive crowd partying near the Michigan State University campus after fights broke out and officers were pelted with bottles and cans.

Police said in a statement that 3,000 to 4,000 people had gathered for the Cedar Fest party late Saturday. They said 52 people were arrested and 48 others were ticketed for various offenses.

Nearly every officer at the scene reported being struck by a flying object, Police Chief Tom Wibert said at a news conference Sunday. Four small fires were reported, windows were smashed on two police vehicles and several officers and partygoers suffered injuries – mostly cuts and bruises.

Authorities said the crowd became increasingly unruly after 1 a.m., and about 80 officers from various jurisdictions worked to contain the crowd.