More than 30,000 people have been killed in violence since the outbreak of the revolt against the rule of President Bashar al-Assad in March last year, according to the Observatory's figures.
All senior commanders and other officers escaped injury in Wednesday's attack on army headquarters, the military said.
State television showed video footage of a white van exploding beside the military headquarters, and a second blast inside the compound. It said the bombings came 10 minutes apart, and that 14 people were wounded.
A spokesman for the Free Syrian Army's Military Council in Damascus, Ahmed al-Khatib, said the attack was staged with two car bombs.
Syria's military said the "terrorist explosions around and inside the army headquarters were caused by two car bombs driven by suicide attackers."
It was the biggest attack on the security apparatus since a July 18 suicide bombing against a heavily guarded headquarters in Damascus killed four top regime officials, including defense minister General Daoud Rajha and Assad's brother-in-law, Assef Shawkat.
The strike came as the bloodshed dominated proceedings at the UN General Assembly in New York.
"The atrocities mount while the Security Council remains paralysed and I would urge that we try once again to find a path forward" so that the council can try to end the violence, Clinton said.
Her appeal came amid mounting attempts by Western governments to press Russia and China to ease their opposition to UN action against the Assad regime.
David Cameron said the blood of children killed in the conflict had become "a terrible stain on the reputation of this United Nations."
Arab ministers weighed calls for intervention, meeting UN-Arab League envoy Lakhdar Brahimi on the General Assembly sidelines.
Tunisian President Moncef Marzouki told AFP that his country could support an Arab peacekeeping force, and called Assad "a bloodthirsty dictator."
"We have really pushed for a peaceful solution, but if it is necessary, it must be an Arab peacekeeping force, yes," he said.
The emir of Qatar, Sheikh Hamad bin Khalifa Al-Thani, called on Tuesday for an Arab intervention force. However Arab League secretary general Nabil al-Arabi said he did not believe the emir intended it to be a "fighting force."
Aid groups in Syria need better access to civilians trapped by the fighting, European Union humanitarian aid commissioner Kristalina Georgieva said.
"With winter approaching, more populations are at risk," Georgieva said after meeting with officials from NGOs and the main countries providing aid to Syria on the sidelines of the General Assembly.
The UN humanitarian affairs chief, Valerie Amos, said that 2.5 million people affected directly or indirectly by the war need aid.
Some 1.2 million people have been displaced inside Syria and another 300,000 have sought refuge in neighboring countries, such as Turkey and Lebanon, exerting tremendous pressure on them.
All senior commanders and other officers escaped injury in Wednesday's attack on army headquarters, the military said.
State television showed video footage of a white van exploding beside the military headquarters, and a second blast inside the compound. It said the bombings came 10 minutes apart, and that 14 people were wounded.
A spokesman for the Free Syrian Army's Military Council in Damascus, Ahmed al-Khatib, said the attack was staged with two car bombs.
Syria's military said the "terrorist explosions around and inside the army headquarters were caused by two car bombs driven by suicide attackers."
It was the biggest attack on the security apparatus since a July 18 suicide bombing against a heavily guarded headquarters in Damascus killed four top regime officials, including defense minister General Daoud Rajha and Assad's brother-in-law, Assef Shawkat.
The strike came as the bloodshed dominated proceedings at the UN General Assembly in New York.
"The atrocities mount while the Security Council remains paralysed and I would urge that we try once again to find a path forward" so that the council can try to end the violence, Clinton said.
Her appeal came amid mounting attempts by Western governments to press Russia and China to ease their opposition to UN action against the Assad regime.
David Cameron said the blood of children killed in the conflict had become "a terrible stain on the reputation of this United Nations."
Arab ministers weighed calls for intervention, meeting UN-Arab League envoy Lakhdar Brahimi on the General Assembly sidelines.
Tunisian President Moncef Marzouki told AFP that his country could support an Arab peacekeeping force, and called Assad "a bloodthirsty dictator."
"We have really pushed for a peaceful solution, but if it is necessary, it must be an Arab peacekeeping force, yes," he said.
The emir of Qatar, Sheikh Hamad bin Khalifa Al-Thani, called on Tuesday for an Arab intervention force. However Arab League secretary general Nabil al-Arabi said he did not believe the emir intended it to be a "fighting force."
Aid groups in Syria need better access to civilians trapped by the fighting, European Union humanitarian aid commissioner Kristalina Georgieva said.
"With winter approaching, more populations are at risk," Georgieva said after meeting with officials from NGOs and the main countries providing aid to Syria on the sidelines of the General Assembly.
The UN humanitarian affairs chief, Valerie Amos, said that 2.5 million people affected directly or indirectly by the war need aid.
Some 1.2 million people have been displaced inside Syria and another 300,000 have sought refuge in neighboring countries, such as Turkey and Lebanon, exerting tremendous pressure on them.