A US Army soldier opened fire on fellow members of the military at an American base in Baghdad on Monday, leaving five dead, a US defense official said.
The official told reporters at least two others were wounded in the attack at Camp Liberty in the Iraqi capital.
The details of the shooting incident remained unclear but MSNBC reported the soldier turned the gun on himself.
A Pentagon spokesman, Bryan Whitman, called it a “very tragic event” and said the incident was under investigation.
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The shooting was the deadliest incident for US forces in Iraq since April 10 when five American soldiers were killed by a suicide truck bomb that plowed into an Iraqi police compound in the northern city of Mosul.
Liberty is the American military’s largest base in Iraq.