In Lebanon, security forces used water cannons and batons to drive back hundreds of students marching on the American Embassy yesterday protesting the bombing of Iraq and U.S. support for Israel. Officials said at least 12 people were injured. About 500 students tried to march on the fortified compound but were met by about 200 helmeted riot police swinging batons and backed by rifle-toting Army troops atop armored personnel carriers. Large banners denounced Israeli Prime Minister-elect Ariel Sharon and President Bush as “two faces of the same terroristic coin.”