US-led coalition aircraft have targeted four makeshift oil refineries under Islamic State (IS) control in Syria, as well as a command centre.

Early indications were that the attacks by US, Saudi and UAE planes were successful, US Central Command said.

Explosions at a refinery at Tel Abyad, near the Turkish border, lit up the night sky, an eyewitness watching from across the frontier said.

Meanwhile further fighting was reported in the besieged border town of Kobane.

A resident in the town, which has been under attack from Islamic State for more than a week, told the BBC that five shells had fallen there and two over the border in Turkey.

There was no repetition on Sunday of coalition air strikes on IS positions in the area, where Syrian Kurd fighters have been holding out against the militants.

The IS advance in the area sent about 140,000 civilians fleeing towards Turkey.