Syria agents fire at protesters near UN monitors (CBS/AP) BEIRUT - Plainclothes Syrian security agents opened fire at anti-regime protesters near the cars of U.N. monitors in a Damascus suburb Wednesday, a witness said. Amateur video showed people ducking for cover as gunshots rang out. The videos could not be independently confirmed. But the Britain-based activist group Syrian Observatory for Human Rights said Syrian security forces fired at protesters in the suburb of Arbeen, wounding eight. Wednesday's shooting raised concern for the safety of the monitors. Under a plan brokered by U.N.-Arab League envoy Kofi Annan, six observers arrived in Syria over the weekend as an advance team for a larger contingent meant to shore up a week-old cease-fire that has been buckling under regime assaults on opposition strongholds and several bombings and shootings by the rebels. The truce was supposed to pave the way for talks between Assad and the opposition trying to topple him. Annan's spokesman, Ahmad Fazwi, confirmed that the U.N. observers were in Arbeen on Wednesday. He said it would be "appalling" if it was confirmed Syrian forces opened fire in the area. Annan's plan is seen as a last hope for reversing Syria's slide toward civil war after a 13-month-old uprising to oust President Bashar Assad killed more than 9,000 people, according to the U.N. Despite persistent violence, the international community is reluctant to declare the cease-fire dead, in part because it is seen as the only way to end bloodshed in Syria. A deadlocked international community would be hard put to offer an alternative if it were to acknowledge the collapse of the truce. Speaking from Brussels, U.S. Secretary of State Hillary Clinton said the situation in Syria is at a "crucial turning point." Either we succeed in pushing forward with Kofi Annan's plan...with the help of monitors steadily broadening and deepening a zone of non-conflict and peace or we see Assad squandering his last chance before additional measures have to be considered. We will continue to increase the pressure on Assad," she said. Ban Ki-moon, the U.N. chief, is expected to send a letter to the U.N. Security Council later on Wednesday to report on Syrian compliance with the truce, something that will help determine whether conditions are right to expand the observer mission. In Arbeen, residents received word Wednesday that the observer team was en route to their area, said a local activist, who would only give his first name, Ahmed, for fear of repercussions. He said residents rushed into the streets to meet the observers and then walked alongside the U.N. vehicles. He said the U.N. cars and the anti-regime protesters were heading toward a downtown area where Assad supporters and plainclothes security agents had taken up positions. Ahmed said that at some points, the agents fired at the protesters. Amateur video posted online appears to back up the narrative. In one, hundreds of demonstrators are seen crowding around at least three U.N. vehicles, clapping, waving Syrian flags and chanting in support of the rebel Free Syrian Army. A handwritten sign taped to one of the U.N. cars, apparently by the protesters, reads: "The butcher keeps killing, the observers keep observing and the people keep up the revolution." Another video shows hundreds walking along as the two U.N. vehicles slowly make their way through a wide street in Arbeen. When a shot rings out, the two U.N. cars speed away, leaving the demonstrators behind. In a third video posted online by the same user, hundreds of people waving flags are seen in a march. Suddenly, they panic and run for cover. A narrator says they are being shot at while the observers are in the area and gunfire is heard in the background. Syrian Foreign Minister Walid Moallem promised that the regime would respect the cease-fire and withdraw troops from urban centers in line with Annan's peace plan. However, the regime has so far ignored last week's deadline to get tanks and troops off the streets. Instead, Syrian soldiers continued to pound rebellious areas with artillery after an initial lull of about one day at the start the truce. The ongoing attacks have dimmed hopes for Annan's plan. Activists said regime forces fired mortar shells again at the central city of Homs, killing at least two civilians and sending thick gray smoke into the air as loud booms rang across residential areas. Homs has been battered by artillery for weeks, with just a brief respite at the start of the cease-fire. The state news agency said two separate roadside bombs killed 10 members of the security forces and a civilian in northern Syria. SANA reported that six soldiers were killed and 11 wounded in a blast in the village of Mastouma in Idlib province, while a second explosion in the Aleppo region killed four members of the security forces and a civilian. The attacks were a sign that both sides have violated the cease-fire and could prompt the regime to intensify its assault on rebellious areas. Syria's government has portrayed the uprising as a foreign-led conspiracy by terrorists and thugs. Still Moallem insisted Syria is keeping its commitments. Meanwhile, Ban, the U.N. chief, is intensifying efforts to get a large contingent of observers on the ground to salvage the truce. Moallem said in Beijing that Syria would be ready to provide helicopters, but made no reference to Ban's request to the EU. "Syria is ready to make its air force available for the use of this delegation," Moallem said. As we have understood, what is needed are helicopters to evacuate the injured. If that is the issue, then we have the capabilities in our air force to carry this out.