At least one person has died in a bomb in the south of Lebanese capital Beirut that may have targeted an official from the Palestinian group, Hamas.
Security sources say that explosives went off under a vehicle in a stronghold of Lebanon's Islamist militant group Hezbollah.
A number of people were also wounded in the explosion, one of them seriously.
The Lebanese state news agency says that "three bombs tied to each other" were placed under the vehicle.
A senior police official, speaking on condition of anonymity, told the Associated Press Saturday's blast had occurred in a neighbourhood that houses a Hamas office.
Osama Hamdan, the Hamas representative in Lebanon, was not available for comment, according to a person who answered his mobile phone, AP adds.
Hamas, which effectively controls the Gaza Strip inside the Palestinian territories, has representatives both in Beirut and in neighbouring Syria.