Opposition activists are reporting that 20 unarmed men have been executed after being detained in Mezzeh, Damascus, on suspicion of aiding rebels.
Syrian rebel forces seized the army's infantry school in the town of Musalmiyeh, ten miles north of the city of Aleppo, a senior military defector based in Turkey and rebel sources inside Syria have said.
Brigadier General Mustafa al-Sheikh told Reuters:
"This is of big strategic and symbolic importance. The school has ammunition depots and armoured formations and it protects the northern gate to Aleppo."
Rebels celebrate in Syria's second city Aleppo after getting hold of Al Sakhour army post in this footage posted to YouTube which has purportedly been filmed today but cannot be verified.
Israeli Prime Minister Benjamin Netanyahu has spoken of the "great threat" his country could face if the Assad government collapsed and its stock of chemical weapons and missiles fall into the hands of the Lebanese Islamist group Hezbollah.
He told the US "Fox News Sunday" television programme:
We certainly don't want to be exposed to chemical weapons falling into the hands of Hezbollah or some other terror groups. ... It's a great threat.
Syrian army forces have launched an assault on the northern Damascus district of Barzeh and summarily executed five young men - witness and opposition activists have told Reuters.
President Assad and his family are still in the Syrian capital Damascus, Israel's military has told Reuters news agency.
Syrian rebels have captured a third border crossing with Turkey from President Bashar al-Assad's forces today.
Ahmen Zaidan, spokesman for an opposition group called the Higher Council of the Revolution's Leadership, said:
"The Free Syrian Army has taken control of the Bab al-Salam crossing, but Assad's forces are bombarding our positions from afar."
Rebels then posted this film showing the flag of the Free Syrian Army at the border crossing.
A Turkish official at the border confirmed that Bab al-Salam was in rebel hands.
Syrian rebels say they have captured the Bab al-Salam border post with Turkey.
Syrian rebels battled President Bashar al-Assad's forces near the main intelligence base in the northern city of Aleppo today.
Helicopter gunships bombarded several districts of Damascus in an effort to drive out insurgents, witnesses said.
Elite Fourth Division troops were besieging the northern Damascus neighbourhood of Barzeh, according to witnesses.
Syrian helicopter gunships have bombed three districts of Damascus. Meanwhile Syrian rebels have withdrawn from the city's western district, Mezze, after heavy aerial and ground bombardment by Assad's forces.