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The commander of the Syrian Kurdish-led forces says five months of joint intelligence cooperation with the U.S.-led coalition led to the killing of the leader of the Islamic State group.

Mazloum Abdi said in a tweet Sunday that the reported killing of Abu Bakr al-Baghdadi took place in a joint operation following “cooperation on the ground and accurate monitoring” for five months. He called it a “successful and historic” joint intelligence work with the U.S.

The U.S. raid with helicopters took place in the Barisha area north of Idlib city a few kilometers from the Turkish border.

The Kurdish-led forces cooperated with the U.S.-coalition for at least four years to fight IS in Syria until they declared military victory against the group in March.