President Donald Trump is expected to express American unease over a Turkish cross-border offensive into Syria, in a call scheduled with counterpart Recep Tayyip Erdogan, a US official said Tuesday.

"They are likely to talk soon," said a senior US administration official, confirming reports of a Trump-Erdogan call set for Wednesday.

The US is urging restraint from Ankara after the Turkish military hit Kurdish militias that had aided the American-led fight against the Islamic State group.

source: AFP