Lebanon on the Brink

For the past two years Lebanon has tried to avoid getting sucked into the Syrian conflict on its borders. But last month there was a sea change: Hezbollah, the country's largest political party admitted sending thousands of guerillas to fight on behalf of the Syrian regime. In return, Syrian rebels and their supporters have vowed revenge � inside Lebanon itself. With sectarian tensions escalating across the country, Nahed Abouzeid investigates a Lebanon teetering on the brink of an intra-religious war.