The activists said the tanks opened fire at al-Numan Maarat in parts of northern Syria, and causes a number of demonstrators were killed and many more injured.
Acts of violence occurred when Government forces began to launch military operations in a small town nearby, where police said 120 security personnel were killed.
Hundreds of civilians fled the Township and from the surrounding villages to Turkey to save themselves from the attack.
Among the activists of the opposition told the BBC that military Syria apply '' scorched earth '' tactics at Jisr al-Shughour with combat helicopters and tanks shelled the town as troops move forward membuldozer houses and burning of crops and farmland.
The Government of Syria has not yet issued a statement in response to this claim.
Activist antipemerintah said 11 people were killed in the province of Idlib at the northern Syria. Most of those killed at Maarat al-Numan where tanks fired on the demonstration. The helicopter also reported shooting masses of protesters.
The citizens of Syria to bury the victims killed in the Jisr al-ShughurGovernment television reported the armed gang invaded Syria a police station in the small town.
A prominent opposition Syria told the news agency the Associated Press in a telephone contact that thousands of demonstrators who merangsek forward to make security apparatus were overwhelmed and then burn a courthouse and police station there.
Syria blocking foreign journalists, including reporters FROM the BBC, go to the area, and this undermines verify reports from Syria.
Meanwhile, five demonstrators were killed in the coastal city of antipemerintah Latakia, said the sources among the activists.
Elsewhere in Syria, two civilians were killed at the hands of the security apparatus in the South of the province of Deraa and four others were killed in the District of Qaboun in the capital, Damascus.
Mass demonstrations against the regime of President Bashar al-Assad rolling since March and later became a weekly event after Friday prayers.
The institutions of HUMAN RIGHTS advocates say more than 1,300 people died when the Government tried to silence the opposition action. Most of them innocent civilians, they said.
The Government of Syria shook off the number of published human rights activist and State security personnel of about 500 people were killed.