Twin blasts on a mosque in the Iraqi capital Baghdad have killed at least seven worshipers and wounded 20 others, security officials said.

Wednesday's attack on the predominantly Shia Sadr City district caused damage to nearby buildings, the officials, who wished to remain anonymous, said.

The mosque is frequented by supporters of Shia cleric Muqtada's al-Sadr whose Sairoon coalition won a plurality of seats, 54 in total, in the last parliamentary elections earlier in May.

May 16, at least eight people lost their lives and dozens more sustained injuries when a powerful bomb blast ripped through a funeral near the Iraqi capital city of Baghdad.

There was no immediate claim of responsibility for the deadly attack, but such assaults bear the hallmarks of those carried out by remnants of the Takfiri Daesh terrorist group.