Abu Sayyaf, key ISIS figure in Syria, killed in U.S. raid

U.S. Special Operations forces killed a key ISIS commander during a daring raid in eastern Syria overnight Friday to Saturday - securing intelligence on how the terror organization operates, communicates and earns money, U.S. government officials said.

The ISIS commander, identified by his nom de guerre Abu Sayyaf, was killed in a heavy firefight after he resisted capture in the raid at al-Omar, U.S. Defense Secretary Ash Carter said in a statement.

The officials identified Sayyaf's captured wife as Umm Sayyaf, an Iraqi. She is now being held in Iraq.

The U.S. government did not release Sayyaf's real name.

The ground operation was led by the Army's Delta Force, sources familiar with the mission told CNN. There were about two dozen members of Delta Force involved, sources said.

Delta Force entered the target area on Blackhawk helicopters and V-22 aircraft, a U.S. official familiar with the operation said. ISIS fighters defended the multistory building from inside and outside positions.

Abu Sayyaf was killed as he "tried to engage" U.S. troops, the official said.

Carter said he had ordered the raid at the direction of President Barack Obama. All the U.S. troops involved returned safely.