The bodies of dozens of young men, all apparently summarily executed, have been found in the northern Syrian city of Aleppo.
UK-based Syrian Observatory for Human Rights says that at least 71 bodies were found by a river in the western Bustan al-Qasr district.
Most had their hands tied behind their backs and gunshot wounds to the head.
Hours after the find, UN envoy Lakhdar Brahimi reportedly said Syria was "breaking up before everyone's eyes".
The UN says the conflict has left more than 60,000 people dead.