Moscow (CNN)Russia's Defense Ministry says it is investigating reports that ISIS leader Abu Bakr al-Baghdadi was killed in one of its airstrikes in Syria last month.
The airstrike on May 28 was carried out on the outskirts of the militant group's de facto capital Raqqa, on a command post where ISIS leaders were meeting, according to Russian state media reports.
"According to information, which is being verified via different channels, the meeting was also attended by the (ISIS) leader Ibrahim Abu Bakr al-Baghdadi, who was eliminated in the strike," the ministry said, according to the TASS report in English. Other state media reported that more than 300 "terrorists" were killed in the strike.
An image grab taken from a propaganda video released on July 5, 2014 of ISIS leader Abu Bakr al-Baghdadi in Mosul.
The leaders were discussing their exit from the city through the so-called southern corridor, the ministry said.
The airstrike was carried out following drone footage confirmation of the council's meeting location, state-run Sputnik reports.
US defense officials said they were unable to confirm the reports. Col. Ryan Dillon, a spokesman for the US-led coalition's operation against ISIS in Syria and Iraq, said the coalition "cannot confirm these reports at this time."
There have been multiple reports of Baghdadi's death in the past that have turned out to be false.
Al-Baghdadi: An elusive and brutal leader
Officials had long described the ISIS leader as enemy No. 1 in the fight against ISIS, and speculation had swirled over his whereabouts.
Baghdadi has kept a low profile, speaking out in occasional videos and audio messages.
