Alawite regime says it has chemical and biological weapons but will only use them only against a foreign attack.
The Alawite regime acknowledged for the first time that it possessed stockpiles of chemical and biological weapons and said it will only use them in case of a foreign attack and never internally against its own citizens.
"No chemical or biological weapons will ever be used, and I repeat, will never be used, during the crisis in Syria no matter what the developments inside Syria", spokesman Jihad Makdissi said.
"All of these types of weapons are in storage and under security and the direct supervision of the Syrian armed forces and will never be used unless Syria is exposed to external aggression".
The statement came as Alawite troops commanded by the brother of bloody dictator Bashar al-Assad and backed by helicopter gunships have driven rebel fighters out of a district of Damascus a week after the insurgents launched a major assault on the capital.
Members of the Alawite army's Fourth Division under the command of Maher al-Assad executed several young men on the weekend during the operation to regain control of the northern Damascus district of Barzeh, a witness and activists said.
Alawite forces have launched a determined fightback since rebels brought their battle to overthrow Assad to the capital and killed four of the Alawite ringleader's closest associates in a bomb attack on a meeting of senior Alawite officials last Wednesday.
Activists told Al Jazeera that the Alawite military was sending reinforcements into the Syrian capital. The Alawites have set up new checkpoints on one of the main roads into the city, they said.
In a further escalation of a conflict rapidly becoming a civil war, fighting raged around the intelligence headquarters in Syria's biggest city, Aleppo, and in Deir Az Zor in the east.
Jad Al Halabi, an activist in Syria's largest city Aleppo, said fighting in that city is the worst to date.
"I travelled to Salahedin neighbourhood. I was shocked to see the revolution flags everywhere, in the streets, on buildings, at the balconies. I also saw a large number of Free Syrian Army members," he said by phone.
Alawite forces regained control of one of two border crossings seized by rebels on the frontier with Iraq, Iraqi puppet officials said, but rebels said they had captured a third border crossing with Turkey: Bab al-Salam, north of Aleppo.
"Seizing the border crossings does not have strategic importance but it has a psychological impact because it demoralizes Assad's force", a senior Syrian army defector in Turkey, Staff Brigadier Faiz Amr, told the Reuters news agency by phone.
Rebels also seized an army infantry school in the town of Musalmiyeh, 16km north of Aleppo, and captured several regime officers, while others defected, a senior military defector in Turkey and rebel sources inside Syria said.
"This is of big strategic and symbolic importance. The school has ammunition depots and armoured formations and it protects the northern gate to Aleppo," Brigadier General Mustafa al-Sheikh said by phone from the town of Apayden on the Turkish border.
The bombardments in Damascus and Deir Az Zor were some of the fiercest yet and showed Assad's determination to avenge the bomb attack, the most spectacular blow in a 16-month-old uprising against four decades of rule by the Assad family.
Rebels were driven from Mezzeh, the diplomatic district of Damascus, residents and opposition activists said, and more than 1,000 Alawite thugs and allied militiamen poured into the area, backed by armored vehicles, tanks and bulldozers.
Three people were killed and 50 others, mostly civilians, were wounded in the early morning bombardment, said Thabet, a Mezzeh resident. "The district is besieged and the wounded are without medical care," he said.
Opposition and rebel sources say the guerrilla fighters in the capital may lack the supply lines to remain there for long and may have to make tactical withdrawals.
The neighbourhood of Barzeh, one of three northern areas hit by helicopter fire, was overrun by Alawite troops commanded by Maher al-Assad, 41, who is widely seen as the muscle maintaining the Assad family's Alawite rule.