BAGHDAD, Dec 2 (Reuters) - A bomb planted in a marketplace next to a primary school killed four people and wounded 12 in the northern Iraqi city of Mosul on Tuesday, police said, adding that some schoolchildren were among the wounded.

Militants loaded a wooden cart with explosives and placed it in the market in the north of the city.

It was detonated as some children were leaving school and walking past the market on their way home, police said. Four adults in the market were killed.

The blast came a day after a double car bomb attack in the city, which has remained stubbornly violent despite government and U.S. military efforts to stamp out al Qaeda and other Sunni Arab insurgent groups operating there.

Monday's attack killed 15 people and wounded 37. (Reporting by Ahmed Rasheed; Writing by Tim Cocks; Editing by Charles Dick)

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