A security guard at Walter Reed Army Medical Center opened fire at another guard Wednesday outside a busy entrance to the hospital, police said. No one was injured.The guards had been arguing at about 8:30 a.m. when one of them fired as many as 10 shots, Lt. Jimmie Riley said.
The other guard, who was not hit, ran to a nearby house to call police, Riley said. The guard who fired the shots was taken into custody.