(Photo by Hunter Martin/Getty Images)

STATE COLLEGE, Pa. (AP) - Police say a Penn State fan dressed in a blue and yellow Halloween costume was assaulted by four unknown fans at Beaver Stadium who mistook him for a Michigan fan.

The Centre Daily Times reports that the assault happened Saturday, the night the Nittany Lions defeated the rival Wolverines 41-31.

Police say the men attacked the fan because they thought the colors of his costume indicated he was a Michigan fan. Michigan’s colors are blue and yellow.

The attackers have not been identified.

Police say the victim sustained a possible broken nose and was treated and released from a hospital.