Arrive here in cleveland, ohio, amid very tight security. This is cnn tonight. Im don lemon. Thank you for joining us. The fallen officers identified at matthew gerald, Montrell Jackson and brad garafola. The gunman gavin long, a 29yearold black man from kansas city, missouri. A former marine who served in iraq. Dead in the shootout. The chaos caught on dispatch audio. Officer down. Shots fired, officer down. City officer down. Shots fired. Shots fired on airline. Were finding out about the gunman. Belonging to several conspiracy groups, we are told, including a black sovereign citizens group. That rejects government authority. Chillingly, he killed the officers on his birthday. And president barack obama saying attacks are happening far too often. Tells america this. We as a nation have to be loud and clear that nothing justifies violence against Law Enforcement. Todays deadly attack coming in a city that is my hometown of baton rouge, louisiana, thats still reeling over the shooting