Second Conference of the Group of Friends of the Syrian People at the Istanbul Congress Center in Istanbul, Turkey, April 1, 2012. Photo: wiki commons.

CBS/AP – The uprising in Syria fueled intense clashes in neighboring Lebanon for a third day Monday, with gunmen firing assault rifles and rocket-propelled grenades as sectarian tensions spilled across the border.

At least four people have been killed in Lebanon’s second-largest city, Tripoli, since the gun battles erupted late Saturday. Lebanon and Syria share a complex web of political and sectarian ties and rivalries, which are easily enflamed.

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