Online activists reported hearing the sound of shelling and heavy gunfire early Wednesday in the western Syrian governorate of Homs, DPA reported.
This comes as the Syrian military remains deployed throughout several cities amid continued protests calling for greater freedoms and the ouster of President Bashar al-Assad.
Thousands of Syrian protesters hoping to emulate uprisings in Tunisia and Egypt began protesting in mid-March.
Activists on the Syrian Revolution Facebook page wrote there were no reports of casualties yet on Wednesday, but that the sound of gunfire and tank shells being fired could be heard throughout Homs, the country's largest province.
Meanwhile, a website called Syrian Martyrs released the names of 757 people they said have been killed since the protests began in mid-March. The list includes the names of protesters as well as soldiers and security officers killed in the unrest.
The state-run SANA news agency reported that three officers and three soldiers were killed in security sweeps in Homs and other cities, including Daraa and Banias, on Sunday.
Additionally, 10 workers were killed and three others injured on Sunday when they were "ambushed by an armed terrorist group in Homs," according to SANA.
Director of Homs National Hospital was quoted as saying the workers, who were returning from Lebanon, had been killed by gunfire.