UN observers continued their investigations in Treimsa Sunday (July 15th) after they saw blood and burned out homes during a trip to the village Saturday.

The observers were investigating allegations of a massacre on Thursday in the central Syrian village where activists said at least 150 people were killed by troops and pro-government militiamen.

"On the basis of this preliminary mission, (the UN mission) can confirm that an attack took place in Treimsa on July 12th," said UN spokesperson Sausan Ghosheh, citing evidence such as "blood spatters", "bullet cases", "a burned school and damaged houses with signs of internal burning".

Syrian Foreign Ministry spokesperson Jihad Makdissi said Sunday, "It was a clash between regular forces and armed groups who do not believe in a peaceful solution."

The UN Security Council is scheduled to vote Friday to decide if a 300-member UN mission in Syria will be renewed.

The unarmed observers are tasked with overseeing the enactment of UN-Arab League envoy Kofi Annan's six-point peace plan, which was introduced in April but has not been honoured.

UN Secretary-General Ban Ki-moon is also travelling this week to get support for tougher action on Syria. He is schedule to arrive in Beijing Tuesday.