Six soldiers escorting a team of UN observers have been injured in a explosion in the Syrian town of Deraa, AFP report.

The explosion targeted a Syrian military truck driving in front of UN monitors. The military truck had its windows blown out.

The UN convoy was not hit.

UN special envoy to Syria Kofi Annan addressed the United Nations Security Council on Tuesday saying that his six-point peace plan for Syria is a "possible last chance to avoid civil war".

Annan also acknowledge that the ceasefire introduced last month is an illusion and expressed his concern regarding the escalating violence in the country. "Government troops and armour are still present though in smaller formations. There have been worrying episodes of violence by the government, but we have also seen attacks against government forces, troops and installations," he said.

Bashar al-Jafaari, Syria's ambassador to the UN, blamed the opposition and insurgent for the violence in the country and said the regime was "still facing some Arab, regional and international powers who are deploying huge efforts in order to topple and undermine the mission of the observers....The big problem we are facing right now is the smuggling of weapons, sponsored by some Arab, regional and international powers into Syria."

300 UN monitors should be deployed in the country by the end of the month.