James holmes was insane when he murdered 12 people in a colorado movie theatre good evening, im antonio mora this is al jazeera america. We begin in tennessee, where federal authorities are trying to understand what drove a young man to open fire at two military facilities in chattanooga. Four marines were killed. Police shot and killed a lone gunman. Officials from the fbi and department of justice are scheduled to hold a News Conference. Well bring it to you as soon as it happens. Jonathan betz is in chattanooga for us. Local officials spoke out earlier tonight. What did they say. Well we are expecting officials to speak in a couple of moments, hopefully more information on what may have sparked the attack in chattanooga, tennessee. The mayor held a conference saying the hearts are breaking over the targeted attack focused on those that serve in the u. S. Military. Today is a nightmare for the city of chattanooga. Around 11 oclock this morning, we have someone viciously attack at two