Baghdad - Three people were killed and seven injured when a female suicide bomber blew herself up at a hospital west of Iraq's capital Baghdad on Sunday.

A doctor and his wife were among the injured in the attack that took place in Amiriyat al-Fallujah near the city of Fallujah, 50 kilometres west of Baghdad, the Iraqi al-Buratha news agency reported.

Earlier, US military said that extremists have killed four civilians, a policeman and a US soldier.

The soldier died in northern Baghdad when a bomb exploded by his car on Saturday. Two soldiers suffered injuries in the attack, the military said.

The civilians and the policeman died in attacks in the city of Mosul in the restive province of Diyala and in Madain to the south of Baghdad.

One of the dead was a sanitation worker, who died in the Diyala capital of Baquba when a bomb exploded next to him in a rubbish- collection vehicle, Aswat al-Iraq news agency reported.

Five people were injured in the attack. (dpa)