At least 42 people have been killed across Syria - many of them villagers who tried to approach the besieged southern city of Daraa, a Syrian human rights group said.
Activist Mustafa Osso, who is the head of a human rights group based in Syria which compiles death tolls from the crackdown, warned the number could rise.
Thousands of people took to the streets across the country, calling for President Bashar Assad's downfall and pledging support for the citizens of Daraa.
Daraa is at the heart of the country's six-week uprising. The regime has unleashed the army, backed by tanks and snipers, to crush the protest movement.