November 6, 2009 Fort Hood rampage: Did the military miss warning signs? Play video

(NECN: Kristen Caira, Bridgewater, Mass.) - Police say Major Nidal Malik Hasan killed 13 people and injured 30 others before he was shot by a civilian police officer. An Army spokesperson says Hasana was scheduled to deploy to Afghanistan to counsel soldiers suffering from combat stress.

So what caused Hasan to turn on his own soldiers?

NECN's Kristen Caira spoke to experts about what could have led to the rampage.