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The soldier was killed on site after opening fire with two handguns at the massive Fort Hood complex in Killeen. Two other soldiers are being held as suspects following the shooting. It took place in the Soldier Readiness Centre, which handles administrative details for troops. The pair were detained at a nearby building. Eleven of the victims were troops, while a civilian police officer was also killed. The injured are being treated local hospitals in Texas. Speaking about the shooting, President Obama called it a "horrific outburst of violence". He promised the government would get "answers to every single question" and said his thoughts and prayers were with the wounded and families of the dead. Mr Obama said it was a tragedy to lose a soldier overseas and even more horrifying when they come under fire at an army base on US soil. File picture of soldiers training at Fort Hood Fort Hood, which is home to about 65,000 soldiers, is currently in lockdown mode. Base spokesman Lieutenant-General Bob Cone said it was "a terrible tragedy, stunning." Local congressman John Carter said: "I had a man on the scene, who is my regional director and former chaplin at Fort Hood, waiting to go to a graduation ceremony. "A soldier came running up to him saying, 'sir, don't go over there. Somebody is shooting over there'. "When the soldier ran by him, he saw the soldier didn't know it, but he was wounded. "So, he went into the building and they stopped him, because he had been shot. He heard small arms and some rifle fire while he was there." Fort Hood is the largest US military base in the world and has been rehabilitating many soldiers suffering from post-traumatic stress syndrome, Mr Carter added.