Syria's army has advanced into the southern city of Deraa, with tanks being used to back troops, according to activists and unverified video footage.
One activist was quoted as saying that security forces were "firing in all directions", and at least five people were reportedly killed.
Witnesses also said security forces had opened fire in a suburb of Damascus.
A prominent human rights campaigner said President Bashar al-Assad had launched a "savage war" on protesters.
There have been numerous reports of crackdowns and arrests around Syria over recent days, despite the lifting of an emergency law last week.
On Sunday, at least 13 people were reported to have been killed in the north-western city of Jabla, while dozens of protesters died on Friday.
Deraa is the city in which protesters began calling for political reforms last month. Many are now demanding that President Assad step down.
'Electricity cut'
One activist told the BBC that in Deraa tanks had surrounded al-Omari mosque in the old city and security forces were removing dead bodies from the street.
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