Damascus: The UN admitted a shaky three-week-old truce in Syria is not holding but said the number of observers would be doubled within days, as violence erupted on Thursday near Damascus and the northern city of Aleppo.
The latest unrest, in which at least four students were killed and dozens injured according to a monitoring group, followed a deadly day for the Army yesterday when rebels killed 22 troops.
Syrian security forces and students with knives attacked a protest against President Bashar al-Assad at Aleppo University early today, killing at least four people and arresting 200.
Despite the bloodshed, the head of a UN military observer mission said his team was having a positive effect, although the ceasefire was not holding.
Major General Robert Mood brushed off criticism that the UN Supervision Mission in Syria, or UNSMIS, had been too slow to get off the ground and said their numbers would double within days.
"This is not easy and we are seeing -- by the action, by explosions, by firing -- that the ceasefire is really a shaky one. It`s not holding," the Norwegian general told Britain`s Sky News.
"But what we are also seeing on the ground is that where we have observers present, they have a calming effect and we`re also seeing that those operating on the ground, they take advice from our observers."
However, Syria`s main opposition coalition urged observers to visit detention centres, saying there had been an "escalation of arrests".
"The Syrian National Council calls on the Security Council to pass a resolution demanding the Assad regime stop the escalation in arrests, murders and torture of detainees, and demand their release," the group said.
It also called for the observers to count the number of detained and "carry out frequent and unannounced visits to the prisons" of those locked up in the almost 14-month uprising.
More than 100,000 people have been detained since the outbreak of the revolt against President Bashar al-Assad`s regime, according to the Syrian Observatory for Human Rights, which puts the number still behind bars at more than 25,000.
The United Nations has accused both the regime and its opponents of violating the ceasefire that is part of a peace plan brokered by UN-Arab League envoy Kofi Annan.
The plan calls for a halt to fighting, the withdrawal of heavy weapons from urban areas, a daily humanitarian ceasefire, media access, an inclusive political process, and the right to demonstrate as well as the release of detainees.