The United Nations says Syria poses too much of a risk for observers . The head of the mission says violence has intensified in the last few days . The escalation is limiting the ability of observers to do their work . Violence has soared in recent days with reports of heavy government bombardment of town and chilling massacres of civilians . The monitors went in to monitor compliance to President Annan 's peace plan .
The United Nations says Syria poses too much of a risk for observers . The head of the mission says violence has intensified in the last few days . The escalation is limiting the ability of observers to do their work . The monitors went in to monitor compliance to President Annan 's peace plan .