FLINT, MI -- A witness at Bishop Airport says he saw a police officer bleeding from the neck and a knife laying nearby before the terminal was evacuated today.

"The cop was on his hands and knees bleeding from his neck," said Ken Brown, who was dropping his daughter off at the airport. "I said they need to get him a towel."

Bishop announced that an officer had been injured at the airport on its Facebook page, but officials could not immediately be reached for comment.

Brown said he saw a man detained by police and a knife on the ground near the injured officer.

More than 20 police vehicles from Flint, Burton, Michigan State Police and other agencies responded to the incident.

The airport terminal was evacuated at about 9:40 a.m.