Islamic State kills dozens of US-backed SDF fighters in eastern Syria

The Islamic State group has killed 41 US-backed fighters in Syria who are battling to oust the jihadists from their eastern holdout of Hajin on the Iraqi border, a war monitor said on Saturday.

IS late on Friday dispatched suicide bombers as part of a counter-attack against the Syrian Democratic Forces (SDF), the Britain-based Syrian Observatory for Human rights said.

The SDF fighters, who are backed by US-led coalition airstrikes, were killed overnight, the Observatory said.

In a statement on the Telegram messaging app, IS said it had attacked the village of Sousa late Friday and detonated a car bomb near the village of Al-Baghuza further south, down the Euphrates river.

The IS-linked Aamaq news agency said that more than 40 SDF fighters were killed and posted a video of six gunmen captured alive.

The SDF last month launched an offensive against the jihadists in the Hajin pocket on the eastern banks of the Euphrates, in Deir az-Zour province.

IS has staged a bloody fight back.

Since 10 September, 270 SDF fighters and 496 IS jihadists have been killed in the offensive, the Observatory says.

The coalition estimates that 2,000 IS fighters remain in the Hajin area.

Last week, the Observatory said coalition airstrikes had killed 41 civilians in Sousa, 10 of them children, between 18 and 19 October.

But the coalition said it had targeted an IS command post on 18 October, and denied carrying out any strikes in the area the following day.

IS overran large swathes of Syria and neighbouring Iraq in 2014, proclaiming a "caliphate" across land it controlled.

But the jihadist group has since lost most of that territory to various offensives in both countries.

In Syria, its presence has been reduced to parts of the vast Badia desert and the Hajin pocket.

Syria's war has killed more than 360,000 people since it erupted in 2011 with the brutal repression of anti-government protests.