BAGHDAD, July 4 (Reuters) - U.S. forces backed by warplanes killed an estimated 25 insurgents in a clash north of the Iraqi capital Baghdad, the U.S. military said on Wednesday.

The military said in a statement the fighting occurred during a three-day operation that ended on Monday near the town of Mukhisa in Diyala province, where 10,000 U.S. and Iraqi troops are engaged in a major offensive against al Qaeda.

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