Speculation about Muhsin al-Fadhli’s death surfaced after a U.S. airstrike hit the al Qaeda-linked Khorasan group in Syria.
Pressured by U.S.-led airstrikes in Syria, the militant group said, "This is not war against al-Nusra, but a war against Islam."
The list names figures with key roles in the transportation and training of foreign fighters in Syria and the financing of terror activity.
The expansion of the designated terrorist list could mean more targets for airstrikes in Syria.
Muhsin Al-Fadhli was one of the few al Qaeda operatives with prior knowledge of 9/11. He was only 20 years old at the time.
"We just don't have a confirmation to make at this point," said Pentagon spokesman Colonel Steve Warren. "We don't have personnel on the ground to verify, so we're continuing to assess."
The U.S. targeted the Khorasan group in Syria, an al Qaeda splinter, because it was planning an attack on the west.
Al Qaeda's affiliate on the ground in Syria has already reportedly lost 30 fighters.
An al Qaeda splinter group named Jound al Khilafa, or "Soldiers of the caliphate," claimed responsibility for the abduction.
Al Qaeda in the Arabian Peninsula is taking advantage of chaos in Yemen; U.S. drones and special forces failed to stop it.
Al Qaeda dismissed as "lies" a U.S. assessment that it is in decline, but a defiant online message issued by the network on Sunday made no mention of the ultra-hardline Islamic State group widely seen as its rival for the leadership of global jihad.
The new group, reportedly named "soldiers of the Caliphate in Algeria," accused al Qaeda of “deviating from the true path.”
Al Qaeda's Yemen and Syria affiliates are trying to make and smuggle bombs undetectable by airport security onto U.S.-bound flights.
Fijian peacekeeping troops who were posted in the Golan Heights had been captured two weeks ago by the Nusra Front.
Since independence from Britain in 1970, Fiji has sent more soldiers on U.N. peacekeeping missions than any other nation, on a per capita basis.
Convicted terrorist Jose Padilla was handed a new prison sentence Tuesday after his original sentence was "too lenient."
The Islamist group, a wing of al Qaeda, also pledged to take revenge over the death of Ahmed Abdi Godane last week.
The barbaric group has attracted recruits from across the Muslim world, but also the United States and Europe.
The U.S. has killed the mastermind behind the most prominent Islamist terror group in Somalia.
The organization has said it will now take its jihad to India, Myanmar, Bangladesh and other regions where Muslims are oppressed.
Since the rise of Islamic State, and the emergence of Islamist groups in Africa and elsewhere, al-Qaeda's clout among jihadists has been waning.
Members of the al Qaeda-linked group al-Shabab were killed, but it's unclear if leader Ahmed Abdi Godane was among them.