A suicide bomber has killed at least ten people and injured another 20 inside a Shia mosque in Baghdad.
The explosion comes two days after security forces launched a crackdown against al-Qaeda in the Iraqi capital.
Shortly after the blast, mortar bombs hit houses and shops on the edge of Baghdad, killing at least three people.
The blast at the Buratha mosque in northern Baghdad took place as worshippers were gathering for Friday's noon prayers.
On 7 April, three suicide bombers dressed as women attacked the same mosque, killing at least 71 people.
Al-Qaeda in Iraq has attacked Shia mosques as part of a campaign to ignite a civil war between Shia and Sunni Arabs.
Meanwhile, gunmen killed the local head of a Sunni religious group in Basra this morning.
Unknown gunmen shot dead Yusif al-Hassan near the mosque where he led prayers.
He was a senior member of the Muslim Scholars Association, a group from the Sunni minority community that is critical of the US-backed political process.
