The United Nations says security forces have killed at least 9,000 people, while Damascus says 2,600 of its personnel have died at the hands of insurgents that have seized control of pockets of towns and cities across the country of 23 million and continue to launch daily guerrilla attacks.
The state-run news agency SANA said on Tuesday customs officials on the Syria-Lebanon border had seized a car stuffed with ammunition and weapons, including three machine guns and a rocket-propelled grenade launcher.
A small group of unarmed U.N. military observers has been in Syria for just over a week to track an April 12 truce engineered by former U.N. Secretary General Kofi Annan.
Under the terms of the deal, both sides are meant to observe a ceasefire while the military withdraws tanks and heavy weapons from population centers - requirements that the United Nations made clear on Monday were not being heeded.
"The cessation of armed violence remains incomplete," Lynn Pascoe, U.N. undersecretary-general for political affairs, told the Security Council during a debate on the Middle East.
The observer mission is supposed to grow to 300 unarmed personnel, although the minimal presence already on the ground has led to a decline in the daily death toll, activists say.
However, they accuse Assad's army of simply parking tanks out of sight on farms on the outskirts of towns and cities and resuming operations the moment monitors' backs are turned.