"Victims were either killed by execution at gunpoint, or slaughtered with knives," a statement said.
There were concerns that
Hereditary President-for-Life Bashir Pencilneckal-Assad's
Lord of the Baath...
forces "will re-enter the village in the coming hours, as Khirbet Suda remains under a crippling blockade," the statement added.
It said reports from the area were scarce because of a "massive blackout".
"We are especially concerned about isolated villages, surrounded by villages loyal to Assad," the statement said.