BAGHDAD, Iraq - Sunni-led insurgents killed six Iraqi police at a checkpoint Friday and fired a mortar round that struck a home outside the capital, killing a child, as Shiites began celebrating a major Muslim holiday. Al-Qaida in Iraq threatened more attacks on diplomats here.

Also Friday, the U.S. military said it had killed five senior al-Qaida in Iraq figures during an airstrike last Saturday in Husaybah near the Syrian border. The five, including at least one North African, were responsible for bombings against U.S. and Iraqi forces, the announcement said.

The insurgents fired mortar rounds, then arrived in eight cars and opened fire, a police officer said. At least six policemen were killed and 10 wounded in the ensuing gunbattle, and it was not immediately known if any militants were hurt, the officer said, speaking on condition of anonymity out of concern for his own safety.

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