A monitoring group has claimed that militants kidnapped at least 400 civilians when they attacked the Syrian city of Deir al-Zor.
The US has demanded that Syria allow aid in to Homs, as peace talks over the future of President Bashar al-Assad continue.
The funeral of an assassinated Lebanese intelligence chief ended in violence as mourners broke away and tried to storm the prime minister's offices.
Syrians have voted in elections touted by authorities as a political milestone but dismissed by opposition as a facade as people are killed daily.
As the monitors head out of Syria, the Arab League has called on the United Nations to support a plan to end President Bashar al-Assad's rule.
Syrian security forces have killed more protesters as hundreds of thousands demonstrated against the government of President Bashar al-Assad.
A Sudanese general has flown to Damascus to head an Arab League mission to check Syria's compliance with a peace plan to halt a crackdown on unrest.
Syrian forces killed at least eight people when they opened fire to disperse protests against President Bashar al-Assad after Friday prayers.
Syrian President Bashar al-Assad warned the West his nation would not tolerate any interference, saying that unrest had become more militant.
Syrian forces killed at least 63 civilians in attacks to crush pro-democracy demonstrations on Friday, the human rights organisation Sawasiah said.