reporting active gunfire as the first officers arrived. a bystander livestreaming as teams rushed to the scene. today, the authorities said the suspect locked the gates at that complex with bike locks, trapping those inside before firing into the windows. police firing at him from outside. cutting the lock, they then found the gunman injured inside and the bodies of the four who did not survive. and then, of course, the images of loved ones, of neighbors comforting one another as investigators worked into the night. police say this was not a random act of violence, that the gunman knew the victims. again, authorities taking questions just moments ago and abc s kaylee hartung on the scene in california tonight. you should be careful. they re shooting. there s a shootout. you should back up. reporter: the horrific scene in orange, california, unfolding on a bystander s livestream. there is about ten gunshots and cops are running right there. look at that. reporter: officers runni