Yet another crackdown on the city of Homs has left at least 217 people dead, claims the Syrian Observatory for Human Rights.
Syrian forces are said to have used artillery and mortars, killing 138 in a district of Homs called Khalidiya.
This came on the same day people commemorated the death of more than 10,000 people who died when the government put down an Islamist uprising in Hama in 1982.
The United Nations Security Council is expected to vote on a resolution on Saturday, asking President Bashar al-Assad to hand power over to his deputy.
However, it is unclear whether Russia – which has significant ties to Syria – will use its veto.