US President Barack Obama floated the idea of joint action with Turkey to capture the Syrian city of Raqqa from Islamic State, Turkish President Tayyip Erdogan said in remarks published on Wednesday.
At least 24 Islamic State group fighters and eight civilians were killed in air strikes Sunday on Syria's Raqqa, the de facto capital of IS, a monitor said.
A wave of air strikes killed at least 39 civilians on Saturday in Raqqa, the main stronghold of the Islamic State jihadist group in Syria, a monitoring group said.
At least 16 civilians, among them eight children, were killed on Friday in air strikes on the northern Syrian city of Raqqa by unidentified planes, a monitoring group said.
The Syrian Observatory for Human Rights said that at least 38 civilians were killed in air strikes carried out by a US-led coalition in Hasaka province in northeast Syria in the past two days.
At least 63 people, including nine children, have died in air strikes believed to be carried out by Russian warplanes on a town in eastern Syria, the Syrian Observatory for Human Rights said on Sunday.
