A security guard saw the gunman and tried to stop him, but the man ran into the school, police said. Police searched, room by room, looking for the man.
When they reviewed surveillance footage, they learned that he went in one door and out another.
The two high schools were placed on lockdown around 2 p.m. after police called to report that a person with a gun was heading toward Harding High School, officials from the superintendent said. The lockdown was lifted just before 3 p.m. and students were being sent home