The Russian Defense Ministry said it has investigated whether a Russian airstrike in Syria killed Daesh leader Abu Bakr al-Baghdadi, the TASS news agency reported Friday.

The airstrike targeted a meeting of Daesh leaders and was carried out on May 28, the agencies cited the ministry as saying.

Senior leaders of the Daesh terrorist group were meeting at the time of the May 28 strike, the ministry said in a statement by Tass.

"According to the information which is now being checked via various channels, Daesh leader Abu Bakr al-Baghdadi, who was eliminated by the airstrike, was also present at the meeting," RIA news agency quoted the ministry as saying.

Baghdadi, who has a $25-million bounty on his head, has managed to evade being killed or captured by the U.S.-led anti-Daesh coalition throughout its more than two-year campaign in Iraq and Syria. Sporadic rumors have continued to mount that he was killed in a variety of U.S.-led actions, but little evidence has surfaced to support those claims.