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The officials say the convoy was destroyed.

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Many of America’s allies backed the U.S. intervention, pledging urgent steps to assist the legions of refugees and displaced people. Those in jeopardy included thousands of members of the Yazidi religious minority whose plight – trapped on a mountaintop by the militants – prompted the U.S. to airdrop crates of food and water to them.

The extremists’ “campaign of terror against the innocent, including the Yazidi and Christian minorities, and its grotesque and targeted acts of violence bear all the warning signs and hallmarks of genocide,” said U.S. Secretary of State John Kerry. “For anyone who needed a wake-up call, this is it.”

Underscoring the sense of alarm, a spokesman for Iraq’s human rights ministry said hundreds of Yazidi women had been taken captive by the militants. Kamil Amin, citing reports from the victims’ families, said some of the women were being held in schools in Iraq’s second-largest city, Mosul.

“We think that the terrorists by now consider them slaves and they have vicious plans for them,” Amin told The Associated Press. “We think that these women are going to be used in demeaning ways by those terrorists to satisfy their animalistic urges in a way that contradicts all the human and Islamic values.”

For the U.S. military, which withdrew its forces from Iraq in late 2011 after more than eight years of war, the re-engagement began when two F/A-18 jets dropped 500-pound bombs on a piece of artillery and the truck towing it. The Pentagon said the militants were using the artillery to shell Kurdish forces defending Irbil, the capital of Iraq’s autonomous Kurdish region and a base for numerous American personnel.