Tuesday pushed the death toll for two days of violence across Syria to more than 200, and was one of the deadliest single events of the entire nine-month uprising against President Bashar Assad's authoritarian rule.
The offensive targeted the village of Kfar Owaid, about 30 miles from the northern border with Turkey. It is part of the rugged mountainous region of Jabal al-Zawiyah, which has been the scene of clashes between troops and army defectors and intense anti-government protests for weeks. Syrian troops began attacking the region on Saturday, residents said.
"It was an organized massacre," said Rami Abdul-Rahman, head of the British-based activist group Syrian Observatory for Human Rights. "The troops surrounded people then killed them."
Syrian officials have not commented on the allegations.
One villager who is an anti-government activist told The Associated Press by telephone that scores of residents and activists fled Tuesday morning to the nearby Budnaya Valley, where they were completely surrounded by troops. The forces bombarded them with tank shells, rockets and heavy machine gun fire. The man, who identified himself only as Abu Rabih for fear of government reprisal, said troops also used bombs filled with nails to increase the number of casualties.
"What happened yesterday was a crime against humanity," Abu Rabih said. He said 110 people were killed in the attack and 56 of the dead were buried in Kfar Owaid on Wednesday. Others were buried in villages nearby.
Abu Rabih said the Jabal al-Zawiyah region has been under intense attack by government forces since Saturday.
Assad agreed Monday to allow foreign monitors under an Arab League plan aimed at stopping the bloodshed. But the huge toll from the crackdown on Monday and Tuesday has reinforced opposition suspicions that Assad is just playing for time to stall a new round of international condemnation and sanctions. The crackdown has already left Assad internationally isolated and under tremendous pressure from the Arab world as well as the west.