NEW : At least 17 people are killed and 77 injured in a large blast in Beirut , state media say . U.N. representative in Lebanon is ` ` yet another appalling act of terrorism '' CNN 's Nic Robertson , Mohammed Tawfeeq and Larry Register contributed to this report . The neighborhood hit by the car bomb is described as a Hezbollah stronghold . Tensions are rising in Lebanon ; many are angered by Lebanon 's role in Syria 's conflict .
NEW : At least 17 people are killed and 77 injured in a large blast in Beirut , state media say . U.N. representative in Lebanon is ` ` yet another appalling act of terrorism '' The neighborhood hit by the car bomb is described as a Hezbollah stronghold . Tensions are rising in Lebanon ; many are angered by Lebanon 's role in Syria 's conflict .