BAGHDAD, Oct 21 (Reuters) - U.S. air strikes killed at least 10 people and wounded 42 early on Sunday in the northeastern Baghdad district of Sadr city, a stronghold for Shi'ite militants, police and hospital sources said.

A police source in Sadr city said a 14-year-old boy was among the dead and that the raid at dawn on Sunday left several houses, shops and cars ablaze.

A second police source gave the same toll and said the heavy strikes came after a U.S. vehicle was targeted by a roadside bomb. He said the death toll may rise.

A health ministry source said 10 bodies and 42 wounded had been taken to Imam Ali hospital in Sadr city.

There was no immediate comment from U.S. forces in Iraq.

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