Four U.S. soldiers died in a roadside bombing in Iraq on Sunday, military officials reported, bringing the American toll in the 5-year-old war to the grim milestone of 4,000 deaths.
The four were killed when their vehicle was hit by an improvised explosive device while patrolling a neighborhood in southern Baghdad, the U.S. military headquarters in Iraq reported Sunday night. A fifth soldier was wounded in the attack, which took place about 10 p.m. (3 p.m. ET).
The U.S. milestone comes just days after Americans marked the fifth anniversary of the start of the war. 
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CNN's Mohammed Tawfeeq contributed to this report.
All About Iraq War • Mosul • Baghdad • Baghdad Green Zone
