Damascus: Intensified clashes have hit the Syrian capital here afresh on Tuesday, according to BBC.
Rebel forces say they have launched an all-out assault on the capital, calling it Operation Damascus Volcano.
However, the military has deployed tanks and helicopters to deploy the pro-Assad demonstrators, activists said.
Shooting was reported in one of the main central streets and a square housing the Central Bank.
From the early hours, "regime forces used helicopters fitted with heavy machineguns to attack the (eastern Damascus) district of Qaboon," the Britain-based Syrian Observatory for Human Rights said.
Witnesses also reported heavy machinegun fire in Sabaa Bahrat Square in the heart of Damascus.
Shooting was also reported in Baghdad Street, a main road near the square.
Earlier, rebels and troops clashed fiercely in the neighbourhoods of Al-Hajar al-Aswad and in Al-Midan, which is close to the Old City, witnesses said.
Also, Syria`s former ambassador to Iraq, Nawaf al-Fares said, “the regime would not hesitate to use chemical weapons if it is cornered,” according to BBC reports.