move left away out of the line of fire. >> we have an officer down building 197 on the third floor. there's also a female shot on the roof of building 1333. >> we're doing a sweep of the building for security. we still have a second suspect possibly in. so scene is not secure. >> obviously those dispatch calls give you a feel for just how chaotic it was, how the emergency response teams were trying themselves to figure out what was happening and who was going where, how many people were injured, how many were going to hospitals, a sense of how horrific and chaotic that scene was. we are now learning much more about the moments right before those dispatch calls right when gunman aaron alexis came into the facility to massacre 12 innocent people. a federal law enforcement official tonight saying alexis entered the navy yard facility with a small bag in that bag they believe that he had a disassembled remington 870.