The Syrian Observatory for Human Rights says tens of thousands have been forced out of their homes.
Barack Obama has pledged fresh assistance to war ravaged Jordan's King Abdullah.
Powerful Islamist groups have denounced the opposition team, made up mainly of political exiles, as traitors.
The UN has released details of its investigation into the chemical attack in Syria.
The US and its allies say Assad's forces carried out chemical weapons attack on civilians.
The United Nations says it received Syria's application to join the Chemical Weapons Convention.