customers or employees. some heard from ten to 20 shots. they at some points didn't know where the gunfire was coming from but police knew. they knew that there was an unpredictable gunman with that long gun engaging officers. we don't know if police ever fired anything but we know he fired on them and that turning point brian was talking about where they were able to convince him to surrenderer. the law enforcement has to figure out what was going on inside this man's mind, brianna? >> kyung lah for us. i want to turn to cnn justice correspondent pamela brown has been focussed on the federal response. we know president obama has been briefed. give us the rundown here on all of the agencies that have been involved. >> well, it was a huge response. federal agents flooded that area where the crime scene is from the fbi swat teams and evidence response teams to atf, the entire office went to respond to