Perspective: Sunni insurgents remain biggest threat to U.S. troops in Iraq

WASHINGTON - Sunni Muslim insurgents remain by far the biggest threat to American troops in Iraq, despite recent U.S. claims that Iran is providing Shiite Muslim militia groups with a new type of roadside bomb, a review of American casualty reports shows.

While U.S. military officials have held briefings to publicize their concerns about the potent bombs known as explosively formed projectiles (EFPs) or penetrators, casualty reports suggest that such weapons in the hands of Shiite militias are responsible for a relatively small number of American deaths.

U.S. officials have said that attacks with such weapons increased 150 percent in the past year. But a review of bombings by location shows that less than 10 percent of attacks that killed at least two American service members in the past 14 months were in areas where Shiite militias are dominant.

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