Hizbollah leader Hassan Nasrallah says that popular agitation against Syria's grip on Lebanon could plunge the country back into civil war. Nasrallah told some 100,000 Shi'ite Muslims gathered in Beirut today for the Ashura holy festival that Lebanon has come out of its civil war. He said, however, that the country is jeopardized by opposition calls for a peaceful uprising in reaction to the assassination of former Prime Minister Rafik al-Hariri. In his words, "if the roof collapses, it collapses on all of us." Hizbollah, backed by Syria and Iran, has developed into a formidable Lebanese political party as well as an anti-Israel guerrilla force.