BAGHDAD, Iraq, July 16 — As sectarian violence soars, many Sunni Arab political and religious leaders once staunchly opposed to the American presence here are now saying they need American troops to protect them from the rampages of Shiite militias and Shiite-run government forces.

The pleas from the Sunni Arab leaders have been growing in intensity since an eruption of sectarian bloodletting in February, but they have reached a new pitch in recent days as Shiite militiamen have brazenly shot dead groups of Sunni civilians in broad daylight in Baghdad and other mixed areas of central Iraq............

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