BEIRUT -- Al-Qaida's second-in-command, who goes by the name of Abu al-Khayr al-Masri, has reportedly been killed in a U.S. drone strike in northwestern Syria, a monitoring group said Monday.
A U.S. drone is believed to have carried out the strike near a military base in al-Mastoume in Idlib province, according to the Syrian Observatory for Human Rights, a pro-opposition group that monitors the conflict in Syria.
Also Monday, airstrikes in the rebel-held Idlib province killed at least 11 people, opposition activists said, in the latest spate of violence to mar U.N.-brokered talks in Geneva between the government and the opposition.
Elsewhere in Syria, pro-government forces drove Islamic State militants out of a line of villages in the congested Turkish frontier region, blocking the path of rival Turkish-backed opposition forces from reaching the de facto Islamic State capital, Raqqa, opposition activists said Monday.
The SITE Intelligence Group, which monitors extremist groups, has also reported that al-Masri -- also known as Abdullah Muhammad Rajab Abdulrahman -- the deputy to al-Qaida leader Ayman al-Zawahiri, may have been killed in the U.S. airstrike on an unmarked sedan Sunday evening. It cited reports circulating on jihadi social media accounts.
Images of the vehicle believed to have been carrying al-Masri showed damage to the passenger compartment of the beige Kia sedan but no damage to the engine block. The roof was blown open on the right side of the vehicle.
The province falls largely under the control of an al-Qaida-linked rebel coalition. Hundreds of thousands of Syrians displaced by fighting are living as refugees there.
Al-Masri was a close associate of Osama bin Laden and was once the chairman of al-Qaida's management council, according to a Washington Post report citing leaked U.S. intelligence documents dating back to 2008.
Iranian authorities are believed to have jailed him after the 9/11 attacks before releasing him in a prisoner exchange with al-Qaida in Yemen in 2015.
A senior official in a rival jihadi faction in northern Syria urged caution over the reports, saying other top al-Qaida officials in Syria had staged their own deaths only to defect from the group. The official asked not to be identified because of rivalries between the various factions.
There was no immediate comment from the Pentagon.
Government forces and allied Hezbollah fighters meanwhile cut an arc through Islamic State-held territory to reach independent, Kurdish-led forces near the Euphrates River, effectively preventing Turkish-backed Syrian opposition forces from heading south toward Raqqa.
The opposition forces, which seized al-Bab from the Islamic State group last week, will now have to confront government forces or the rival Kurdish forces if they want to reach Raqqa, which is farther southwest along the Euphrates River.
Those forces are accompanied by a deployment of Turkish troops, tanks and artillery inside Syrian territory. Turkey says the nearby Kurdish-led forces are terrorists.
The opposition accused the government of setting up a buffer zone between opposition fighters and the Islamic State.
"The Syrian regime claims it is fighting terrorism, but it is not. It cut the path for the Free Syrian Army factions to reach Raqqa," said Col. Abu Firas, a spokesman for the Free Syrian Army, a loose alliance of mainstream rebels.
The government "claims it wants to fight terrorism but in reality it wants terrorism to stay put because an end to terrorism would mean the end of regime," he said.
He spoke after an opposition delegation met Monday with U.N. mediator Staffan de Mistura to continue talks aimed at resolving Syria's 6-year-old war. The talks, which began last week, have so far been stuck on the agenda.
The government insists that the talks should start with an agreement on the need to fight terrorism, while the opposition wants to discuss a political transition.
Back in Idlib, the activist-run Baladi News network published footage of rescuers searching for victims in the rubble of a block destroyed in presumed government or Russian airstrikes Monday, in the town of Areeha.
The Syrian Civil Defense search-and-rescue group said it had counted 15 fatalities.
The Observatory said at least seven civilians and four other unidentified victims had been killed. It blamed the attack on government warplanes.
Information for this article was contributed by Dominique Soguel of The Associated Press and Weedah Hamzah of DPA.
A Section on 02/28/2017