U.N. observers in Syria have visited the central village of Tremseh, where opposition activists say more than 150 people were killed in an attack on Thursday.

U.N. officials say an 11-vehicle team entered the Sunni farming village in Hama province on Saturday to gather information about the incident.

On Friday, U.N. envoy Kofi Annan blamed government forces and armed militiamen for what he called “atrocities” in Tremseh. Opposition activists said it was the worst single act of violence since the anti-government uprising began last year.

Syrian state media blamed terrorists for the massacres.

Meanwhile, the opposition Syrian Observatory for Human Rights tells VOA at least 31 people were killed in anti-government related violence across Syria on Saturday. Activists also say Syrian forces pounded the southern town of Khirbet Ghazaleh.