"Prior to the US Operation in Idlib Province of Syria last night, information exchange and coordination between the military authorities of both countries took place," the Turkish defence ministry said in a tweet.

It did not give details.

The elusive chief of IS was believed to be dead after a US military raid in the Idlib region, US media reported earlier on Sunday.

The helicopters targeted a home and a car outside the village of Barisha, the UK-based Syrian Observatory for Human Rights said, in the operation which killed nine people.

US President Donald Trump is expected to make a "major statement" on Sunday at 9:00 am (1300 GMT), the White House said.

Some US media reports quoted government sources saying Baghdadi may have killed himself with a suicide vest as US special operations forces descended.