Robert T. Thompson/The Washington Post

A number of fans at Sunday’s home opener for the Washington Redskins were injured when an escalator at FedEx Field malfunctioned shortly before the end of the game, the Prince George’s Country Fire Department confirmed in a statement.

It was not immediately clear what caused the malfunction, which resulted in a pileup of patrons at the landing at the bottom of the escalator. Fifteen people were evaluated for injuries and six were taken to area hospitals, though none of the injuries appeared serious, according to the statement.

Steve Cohen of Arlington said he and his wife were on their way out of the stadium during the fourth quarter when the escalator sped up, then came to an abrupt halt.

Cohen estimated that he saw eight to nine people injured. That included four people who were taken away on stretchers and two who were in neck braces, he said. Cohen said his wife suffered bruises on her leg.

Redskins spokesman Tony Wyllie said, “We’re aware of the incident and we’re gathering all information.”

About a half-dozen fans suffered what were described as minor injuries in an escalator accident while trying to leave a Redskins’ game against the New York Jets last December at FedEx Field.