Thousands of Syrians streamed across the Syrian border into Lebanon, fleeing as fighting in the capital entered its fifth straight day, witnesses said. Residents near the Masnaa crossing point — about 40 kilometres from Damascus — said hundreds of private cars as well as taxis and buses were ferrying people across.

Maj. Gen. Robert Mood, the Norwegian head of nearly 300 unarmed UN observers in Syria, condemned the violence and encouraged a diplomatic solution, which appears increasingly out of reach. He spoke just hours before a planned UN Security council vote on whether to renew the mission’s mandate, which expires Friday, and impose new sanctions on the Damascus regime.

“It pains me to say, but we are not on the track for peace in Syria,” Mood said in Damascus.

The UN vote had been scheduled for Wednesday, but was postponed after key Western nations and Russia failed to agree the text of a resolution aimed ending the escalating violence. Russia, a longtime ally of Syria, has stood by the Syrian regime and vowed to veto any measures that could lead to international military intervention.

In Thursday’s fighting in Damascus, government forces fired heavy machine guns and mortars in battles with rebels in a number of neighbourhoosd in the capital, the Britain-based Syrian Observatory for Human Rights said.

Adding to the confusion, Syria’s state-run TV warned citizens that gunmen were disguising themselves in military uniforms to carry out attacks.   “Gunmen are wearing Republican Guard uniforms in the neighbourhoods of Tadamon, Midan, Qaa and Nahr Aisha, proving that they are planning attacks and crimes,” SANA said.

Many residents were fleeing Damascus’ Mezzeh neighbourhood after troops surrounded it and posted snipers on rooftops while exchanging gunfire with opposition forces.

The Observatory, which relies on a network of activists inside Syria, said rebels damaged one helicopter and disabled three military vehicles.

Rebels fired rocket-propelled grenades at a police station in the Jdeidet Artouz area, killing at least five officers, the group said.

Activist claims could not be independently verified. The Syrian government bars most media from working independently in the country.

The unarmed observers were authorized for 90 days to monitor a cease-fire and implementation of Kofi Annan’s six-point peace plan, but the truce never took hold and the monitors have found themselves largely locked down because of the persistent violence.

Mood said the observers “will become relevant when the political process takes off.”

Syria’s 16-month crisis began with protests inspired by the Arab Spring wave of revolutions, but it has evolved into a civil war, with rebels fighting to topple Assad.

Wednesday’s rebel bomb attack on high-level crisis meeting struck the harshest blow yet at the heart of Assad’s regime. The White House said the bombing showed Assad was ‘losing control’ of Syria.