Shocking shootout at US army base

Monica Cain, wife of soldier Darren Cain, waits outside Fort Hood on November 5, 2009 in Killeen, Texas. At least one gunman killed 12 people and injured 31 in a shooting on a military base at Fort Hood this afternoon. One shooter was killed by military police and at least two other soldiers are in custody.(Getty Images)

News crews gather at a press conference at the main entrance of Fort Hood on November 5, 2009 in Killeen, Texas. At least one gunman killed 12 people and injured 31 in a shooting on a military base at Fort Hood this afternoon. One shooter was killed by military police and at least two other soldiers are in custody. (Getty Images)

Members of the military and police stand outside Fort Hood on November 5, 2009 in Killeen, Texas. At least one gunman killed 12 people and injured 31 in a shooting on a military base at Fort Hood this afternoon. One shooter was killed by military police and at least two other soldiers are in custody. (Getty Images)

Lt. Gen. Robert Cone speaks during a press conference near the main entrance to Fort Hood on November 5, 2009 in Killeen, Texas. Maj. Nidal Malik Hasan, an army psychiatrist, killed 12 people and injured 31 in a shooting at the military base at Fort Hood this afternoon. Hasan was earlier incorrectly reported to have been killed.(Getty Images)

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(L-R) Spc. Chad Rings, Spc. David Straub, and Spc. Ryan Howard wait to enter Ft. Hood near the main entrance to the base on November 5, 2009 in Killeen, Texas. Maj. Nidal Malik Hasan, an army psychiatrist, killed 12 people and injured 31 in a shooting at the military base at Fort Hood this afternoon. Hasan was earlier incorrectly reported to have been killed.(Getty Images)