US special forces have killed the leader of the jihadist group Islamic State in a raid in northwest Syria, President Joe Biden said on Thursday.

A senior U.S. administration official said that Abu Ibrahim al-Hashemi al-Quraishi was killed in the operation. Rescue workers said at least 13 people also died, including women and children.

“Thanks to the skill and bravery of our armed forces, we have taken off the battlefield…the leader of ISIS. All Americans have returned safely from the operation,” Biden said in a statement.

Quraishi succeeded Abu Bakr al-Baghdadi who led the group when it took over swathes of Syria and Iraq, ruling over millions of people at the height of its self-declared caliphate.

Baghdadi was killed in Oct. 2019 by U.S. troops – also in a raid in north Syria – after Islamic State fighters were defeated on the battlefield. The group is now waging insurgent attacks in Iraq and Syria.

Pentagon Press Secretary John Kirby earlier described Thursday’s raid as a successful counter-terrorism mission, saying there were no U.S. casualties.

Syrian rescue workers said at least 13 people including six children and four women were killed by clashes and explosions that erupted after the raid began, targeting a house in the Atmeh area near the Turkish border.

U.S. military procedures to guard against civilian casualties are currently under scrutiny https://www.reuters.com/world/study-faults-us-military-civilian-casualties-pentagon-plans-review-2022-01-27 following a high-profile mistaken drone strike in Afghanistan that the Pentagon initially hailed a success.

A number of jihadist groups with links to al Qaeda operate in northwestern Syria, the last major bastion of rebels fighting President Bashar al-Assad in the decade-long Syrian war. Leaders of the Islamic State group have also hidden out in the area.

Residents said helicopters landed and heavy gunfire and explosions were heard during the raid that began around midnight. U.S. forces used loud speakers to warn women and children to leave the area, they said.