A judge has dismissed felony charges against two men accused of attacking Yale University singers in a New Year's Eve brawl.

Judge Kathleen Kelly dropped the felony charges against 20-year-olds Brian Dwyer and Richard Aicardi on Wednesday, saying prosecutors lacked evidence.

Kelly Dwyer and reduced the case against Aicardi to a single count of misdemeanor assault.

Witnesses said that after the all-male a cappella group sang "The Star Spangled Banner," the attackers hurled anti-gay epithets and then beat and kicked some of the singers.