Saadeddine Ghiyyeh, an official in the Islamic Action Front,was shot multiple times in his car as he was leaving home.
A photo on the National News Agency's website appeared toshow Ghiyyeh lying face down in his car with a head wound.
Tripoli has seen on-off clashes between Sunni Muslimmilitants who support a revolt against President Bashar Assadin neighbouring Syria and Lebanese members of Assad's ownAlawite sect, which is an offshoot of Shi'ite Islam.
Ghiyyeh is a Sunni, but supports Hezbollah, and is close toprominent pro-Assad figures in Tripoli. This is the secondattempt on his life. In September, he was lightly wounded whenhis car exploded moments after he parked it.