A picture showing people inspecting damage from airstrikes and artillery shelling in the northern Syrian city of Raqqa, the de facto capital of the ISIS.

:: US-backed Syrian militias accused the Syrian government on Monday of bombing their positions southwest of Raqqa city in recent days and threatened to retaliate if the attacks continue.

“The regime’s forces…have mounted large-scale attacks using planes, artillery, and tanks,” Syrian Democratic Forces spokesman Talal Selo said in a statement.

A US warplane shot down a Syrian army jet on Sunday southwest of Raqqa, with Washington saying the army had dropped bombs near US-backed forces and Damascus saying the plane had been flying a mission against ISIS militants.

There was no immediate comment from the Syrian army.