Beirut: Syrian fighters backed by the US on Thursday gave Daesh jihadists 48 hours to leave their stronghold of Manbij in an effort to “protect civilian lives” there.

“This initiative is the last remaining chance for besieged members of Daesh to leave the town,” said the Manbij Military Council, part of the Syrian Democratic Forces (SDF) alliance.

The warning came two days after strikes launched by the US-led coalition fighting Daesh reportedly killed at least 56 civilians fleeing a town near Manbij.

Coalition warplanes have carried out intense raids in support of the SDF fighters as they seek to oust Daesh from Manbij and surrounding areas.

The council said that Daesh fighters would be allowed to take individual light weapons with them.

The statement also called for civilians to try to leave the town or distance themselves from areas where clashes are taking place.

It follows an intense backlash over the reported deaths of at least 56 civilians, including children, in US-led strikes on a Daesh-held village near Manbij earlier this week.

The deaths provoked local protests, as well as opposition calls for a halt to such strikes and demands for a thorough investigation.

The US-led coalition has said it is investigating reports of civilian deaths in the strikes.

An SDF commander said that tribal leaders in Manbij had suggested a 48-hour ultimatum last week.

“But we took this decision now after Daesh used residents as human shields, after the media pressure on us, and to protect whatever civilians are left in the town,” the commander said on condition of anonymity.

Clashes and air strikes continued on Thursday in Manbij, where SDF forces advanced overnight, said the Syrian Observatory for Human Rights.

Observatory head Rami Abdul Rahman said SDF fighters seized a southern district of the town, “bringing them the closest they have been to the centre of Manbij”.