At least 17 worshippers were killed at a Shiite mosque in central Baghdad on Monday after a suicide bomber detonated his vest. Another 25 people were wounded in the blast, which came a day after 28 people were killed in a similar attack on a mosque in western Baghdad.

The suicide bomber detonated his vest as worshippers were leaving the al-Khairat mosque after noon prayers Monday in the Sinak area of Baghdad, a police officer told the Associated Press. No groups had claimed responsibility as of Monday morning.  

The attack in Baghdad came a day after a suicide bomber targeted a Shiite mosque, killing 28 people and wounding more than 30. Nobody claimed responsibility for Sunday’s bombing, but Agence France-Presse noted that such attacks are usually carried out by Islamic extremists like ISIS, the Sunni militant group also known as the Islamic State. ISIS has seized large swaths of territory in Iraq and Syria and is the target of U.S.-led airstrikes in those two countries. The group has claimed responsibility before for large bombings in Baghdad, especially against Shiite targets.

At least four people were killed in a separate attack on Sunday, when a roadside bomb detonated near a patrol of Iraqi security forces in Tarmiyah, north of Baghdad, according to AFP. At least eight people were wounded in that attack. 

The two bombings were the latest in a string of attacks targeting the Iraqi capital. Last week, a car bomb exploded in the eastern portion of the city, killing three and wounding 25. Another suicide car bomb detonated in Aden Square, in northern Baghdad, killing 22 and wounding 41. Ahmed al-Khafaji, a Shiite member of parliament, was one of 54 people wounded in a second suicide car bomb attack in northern Baghdad that also killed 24 people. A bomb also went off in the Mredi market in Sadr City, a suburb of Baghdad, in an attack that killed eight people and injured 25 others.