A high school graduation ceremony in upstate New York ended with a brawl that injured one police officer and led to the arrest of two teenagers, the Albany Times Union reported.

The brawl outside Watervliet High School in suburban Albany on Thursday night required four police agencies to respond before it was under control, police said.

Police arrested 18-year-old Damion M. Walker and an unidentified teen boy, the Times Union reported. Both are charged with misdemeanor obstructing governmental administration.

Watervliet Police Chief Mark Spain told the Times Union that authorities "have no idea" what sparked the fight,  which involved more than 30 people brawling in the parking lot.