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BAGHDAD (AP) -- Iraqi security officials say four people have been killed in attacks in Baghdad and the northern city of Mosul.

They say two police officers were killed late Saturday when a bomb attached to their car exploded. Also, a member of a U.S.-backed Sunni militia that revolted against al-Qaida was shot dead Sunday by unidentified gunmen.

Both attacks took place in the primarily Sunni neighborhood of Azamiyah in north Baghdad.

Meanwhile, police officials said gunmen killed a school teacher in a drive-by shooting near his home in the northern city of Mosul.

The officials spoke on condition of anonymity because they were not authorized to speak to the media.

Violence has fallen sharply in Iraq, but attacks still occur almost daily.

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