The bodies of more than 230 people believed to have been killed by Islamic State (IS) have been found in a mass grave in eastern Syria, activists say.

The Syrian Observatory for Human Rights said they were thought to be members of a tribe that fought the jihadist group in Deir al-Zour province in the summer.

The mass grave was discovered after members of the tribe were allowed to return to their homes by IS, it added.

Last month, the UN said it had received reports of a massacre there in August.

BBC