U.N. observers in Syria have left their headquarters in Damascus to try to reach a village where more than 150 people were killed in an attack on Thursday.

Observers were seen loading their vehicles Saturday before setting off in the direction of Hama province.

The head of the U.N. observer team in Syria, General Robert Mood, suspended operations last month due to safety risks to the 300 observers in the country.

On Friday, U.N. Secretary-General Ban Ki-moon blamed Syria's government for the attack on the village of Tremseh.

Syrian opposition activists say up to 220 people died when government forces shelled Tremseh.

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