UPDATED: Pentagon officials say five Americans are dead after a U.S. soldier opened fire at a U.S. base in Baghdad. They say the attacker is in custody.
The officials say the shootings happened on Camp Liberty at a stress clinic, where troops can go for help with the stresses of combat or stress from personal issues.
One senior military official in Washington says it's unclear whether those killed are workers at the clinic or were there for counseling. He says officials also are unsure whether all the dead are members of the military.
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