Inside Story - What is driving Lebanon's sectarian clashes?

Street battles are continuing in Lebanon's northern city of Tripoli as the unrest in neighbouring Syria spills over across the border. But the violence between supporters and opponents of the government in Syria has taken on a sharp sectarian edge. Could these localised conflicts spark nationwide violence, especially in a country that remains largely fragmented? Guests: Kamel Wazne, Naim Salem, Basem Shabb.