WASHINGTON >> American airstrikes overnight in Syria targeted a cell of al-Qaida militants, hitting and possibly killing a top bomb-maker in the group, two senior U.S. officials said Thursday, amid widespread reports that other rebel factions were also hit.

It wasn’t certain whether the bomb-maker, French militant David Drugeon, was killed or injured, but the officials said the strikes hit their intended targets near Sarmada, in the country’s northwest. The officials were not authorized to discuss the issue publicly so spoke on condition of anonymity.

Gen. Lloyd Austin, the Central Command commander in charge of U.S. military operations throughout the Middle East, said separately at a Washington forum that he would not discuss results of the strikes until they had been more fully studied. He suggested, however, Drugeon may have been hit, or at least targeted.

"He is clearly one of the leadership elements and one of the most dangerous elements in that organization," Austin said. "And so any time we can take their leadership out, it’s a good thing."

One of the U.S. officials said Drugeon’s bomb-making skills were nearly as worrisome as those of Ibrahim al-Asiri, a member of al-Qaida’s Yemen affiliate who has built three nonmetallic devices that were smuggled onto U.S.-bound jet liners. None detonated.

Drudgeon, a convert to Islam believed to be 24, spent three years fighting in Afghanistan and Pakistan before coming to Syria in late 2012 or early 2014, U.S. officials have said.

In Paris, the French interior minister refused to confirm reports Drudgeon was killed or injured.

At the Pentagon, Army Col. Steve Warren said the strikes hit five targets at two locations.

Noting that reports coming out of the region suggest members of other militant groups were hit, Warren that the Khorasan Group was the pre-planned target of the strikes.

The Khorasan Group, he said, "is a group of personnel, some of whom are also al-Nusra affiliated, some of whom are al-Qaida affiliated, some of whom are affiliated with other organizations. But these strikes weren’t specifically targeting any of those other organizations. They were targeting the Khorasan group. If a terrorist happens to be a member of both groups, so be it."

Austin said none of the airstrikes was aimed at al-Nusra. In other remarks about the U.S.-led military campaign against the Islamic State group in Iraq and Syria, Austin said he believes there are between 9,000 and 17,000 "core fighters" in the group. He noted that some in the U.S. government have estimated the number at upward of 30,000, but he said he believes the figure is much lower if active fighters alone are counted.

Austin also portrayed IS as on the defensive, limited in its ability to move without getting bombed.

"As we listen to them we know the impact of the precision strikes is demoralizing them," the general said.

"They’re afraid to congregate in any sizeable formations," he said, adding that the group nonetheless remains a formidable foe.

The targets included bomb-making facilities, training areas and meeting locations. U.S. officials say the Khorasan Group is made up of al-Qaida veterans of wars in Afghanistan and Pakistan who traveled to Syria to link up with the Nusra Front fighters. Officials say the group has been actively planning attacks against the West.

When airstrikes began in Syria in late September, the U.S. launched more than 20 Tomahawk cruise missiles and other bombs on eight Khorasan Group targets near Aleppo in northwestern Syria.

Warren said the U.S. believes the latest strikes had a degrading effect because both facilities and individuals were destroyed.

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Associated Press writers Robert Burns and Ken Dilanian contributed to this report.