sentences:  The opposition accused the government camp of starting the riots and the four dead included two Hezbollah students, who were fired at from rooftops.Opposition backers said gunmen fired from apartment balconies near the school, wounding several people.Students said the clashes began with a scuffle in the cafeteria of Beirut Arab University and degenerated into a melee as youths in the surrounding Tarik el-Jadideh district moved in.