The Russian Defense Ministry said Friday that a bombing by its air forces could have killed Daesh leader Abu Bakr al-Baghdadi near the Syrian city of Raqqa in late May.

The air strike of Russian fighters took place on 28 May and was directed against a meeting of senior officials of the terrorist group, which is believed to be present Abu Bakr al-Baghdadi, Daesh’s top man and self-proclaimed “caliph.” The attack was carried out by Sujói Su-35 and Su-34 fighters from the Russian Air Force between 0.35 and 0.45 hours on May 28 against the Daesh Military Council meeting.

In a statement, the Russian Ministry of Defense has said that the bombing killed an as yet undetermined number of members of the terrorist group’s Military Council, about 30 middle managers and up to 300 militiamen working as escorts for senior officials gathered in Raqqa.

Meanwhile, the international coalition led by the US “can not confirm” the Russian announcement. “We can not confirm this information at this time,” a coalition spokesman said.