UN and Arab League envoy for Syria Kofi Annan has said he is “shocked and appalled” at reports of mass killings in the Syrian village of Tremseh.
Activists say the army and pro-government militiamen killed 200 people in the village on Thursday. The Syrian government blamed “terrorist groups”.
Mr Annan accused the government of violating his six-point peace plan.
If the death toll in Tremseh is confirmed, it would be the bloodiest single event in the Syrian conflict.
Residents of the village, in Hama province, told activists it was attacked with helicopter gunships and tanks, and later by the pro-government Shabiha militia, who carried out execution-style killings.