Obama warns Assad U.S. could act

WASHINGTON/BEIRUT (Reuters) - U.S. forces could move against Syrian leader Bashar al-Assad, President Barack Obama warned, notably if he deploys his chemical weapons against rebels trying to overthrow him. In some of his strongest language yet on Syria, on a day when U.N. observers pulled out after a fruitless bid for peace and Assad's forces mounted new attacks, the U.S. leader said Assad faced.