"Seventeen protesters were killed in a shooting in the village of Sanamen as they were headed toward Daraa," a tribal town 100 kilometres (60 miles) south of Damascus, he told AFP, requesting anonymity.
The news could not be confirmed by independent sources or hospitals in the area.
The Daraa-based activist said security forces on Friday also opened fire on protesters who gathered near the home in Daraa of the town governor, who was fired from the post earlier this week.
Activists have accused security forces of killing more than 100 people on Wednesday alone in the town, which is home to some 75,000 people.
Journalists on Friday were asked to leave Daraa, a tribal town near the Syrian-Jordanian border, shortly before the funerals of two people killed in a shooting on protesters earlier this week.
One resident, contacted by telephone, said residents had gathered for the burials and marched toward the cemetery, chanting: "With our souls, with our blood, we will sacrifice for our martyrs."
AFP reporters saw soldiers deploy on the roads leading to Daraa, bringing with them sandbags, as they were escorted out of the town.
Syria this month began to witness unprecedented protests demanding major reforms in the country, which has been ruled by the Baath party for close to 50 years. (*)
Editor: Kunto Wibisono
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