NEW YORK (CBSNewYork) — Russia is claiming that a key leader of ISIS has been killed in an airstrike.

If true, it could be a major development in the war against the Islamic State Group.

Russia said Abu Bakr al-Baghdadi was killed in a Russian strike in late May along with other senior group commanders attending a meeting in Syria.

Russia says the military began planning the hit after getting word that IS leaders were going to gather.

The anti-Islamic State coalition led by the United States said it cannot confirm the report.

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