4,000

BAGHDAD, Iraq (CNN) --

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. Eight of those killed were civilians working for the Pentagon.

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.

Meanwhile, estimates of the Iraqi death toll range from about 80,000 to the hundreds of thousands, with another 2 million forced to leave the country and 2.5 million people displaced within Iraq, according to the U.N. High Commissioner for Refugees.

But the surge "worked," the economy is fine and John (Bush III) McCain wants to stay for another hundred years at the cost of $12 billion a month and countless lives lost.