2 killed in northern Iraq

BAGHDAD, Iraq (CNN) - A civilian and a police officer were killed in violence Saturday in a restive northern Iraqi city, the U.S. military said.

The incident occurred in Mosul, the Nineveh province city where there is a strong al Qaeda in Iraq presence and where U.S. and Iraqi forces have stepped up their fight against extremists.

A push cart exploded, killing an Iraqi civilian and wounding three civilians and two police officers, the U.S. military said. After the blast, two suspected al Qaeda in Iraq members killed a police officer, the military said. Police detained the pair.