Syrian army forces continued its massive operation in the northern province of Idlib, as more tanks were deployed in its different cities, activists said, DPA reported.
Dozens of tanks arrived at Maarat al-Naaman's northern entrance, activists said online.
The Syrian army was deployed across Idlib, where it launched search-and-arrest operations in several towns on Monday.
Troops were deployed in the restive town of Jisr al-Shaghur and were also stationed across 30 kilometres to the east to Ariha city.
The Syrian forces said the Idlib operation was aimed at "restoring security" after 120 security personnel were killed last week in Jisr al-Shaghur by "armed groups."
The opposition claims those killed were defectors, who were executed by fellow soldiers.
Human rights groups have said that at least 1,300 people have been killed and more than 10,000 detained since the protests calling for the ouster of President Bashar al-Assad started in March.
Videos and updates posted online cannot be independently verified. The Syrian government has banned the entry of foreign media.
Nearly 7,000 Syrians fleeing the violence crossed the border into Turkey, the semi-official Anatolia news agency said.
Despite the violent crackdown on protesters, rallies took place overnight in several cities across Syria, including Aleppo, Daraa, Homs and Damascus, where people were chanting anti-Assad slogans.
Activists also called on the Syria Revolution online group of protesters to gather in front of Russian Embassies all over the world calling on Moscow to change its policies concerning the Syrian unrest.
Russia said it was against any UN resolution condemning Syria saying such a move could aggravate the situation in the country.