The commander of the Little Rock Air Force Base says an SUV jumped a curb and knocked over a street sign near the base's front gate before the driver got out with a rifle.
Col. Charles Brown Jr. said guards began firing after seeing the man was armed and quickly recognized it as a threat. The base hasn't released the man's name, but says he's in critical condition at a hospital.
Brown said at a news conference that he didn't know whether the man fired his weapon at the scene. He says the base is secure.