The attack took place during prayers in the Umm al-Qura mosque in west Baghdad, the city's largest Sunni mosque.

Officials said parliamentarian Khalid al-Fahdawi was among the dead in the strike, the Associated Press reported.

The attack comes towards the end of the Muslim holy month of Ramadan.

The mosque is the main headquarters of the Sunni Endowment, which is responsible for maintaining Sunni Muslim religious sites across Baghdad.

No group immediately claimed responsibility for Sunday's bombing.

There has been a recent flurry of violence across Iraq, although it is much reduced since a peak in 2006-2007.