Officials say a bomb planted near a mosque in north Baghdad killed three Shiite worshippers as they were leaving Friday prayers.

Police and health officials say seven were wounded in the blast on the holy day of the Muslim week.

The blast happened in the primarily Shiite neighborhood of Shaab. Police say some homes have also been damaged.

Health officials say the wounded have been taken to Baghdad's Kindi and Medical City hospitals.

Police and health officials spoke on condition of anonymity because they were not authorized to disclose the information.