Turkey on Wednesday said neither its airspace nor a strategic air base on its territory were used in the latest US-led strikes against Islamic State (IS) insurgents in Syria, a Turkish official said.

"The answer is clear: Neither the (Turkish) airspace nor the Incirlik (air base) were used," the official told AFP in Ankara on condition of anonymity. Incirlik air base in southern Turkey is used by both US and Turkish forces.

Reports had suggested earlier that jets carrying out the latest strikes on IS targets inside Syria were seen coming from the Turkish side of the border.