Mohammed Hamdan suffered a leg injury on Sunday after a bomb planted in his auto detonated, Hamas' media group said in a statement.
Mohammed Hamdan, a senior official in the Palestinian movement Hamas was reportedly wounded in an explosion of a auto on Sunday.
Identified as Mohamed Hamdan, also known as Abu Hamza, the man has been taken to the hospital with "slight injuries".
Hamas leader Jihad Taha blamed Israel for the attack.
According to a medical source at the scene, Hamdan suffered serious wounds to his legs while opening the door to his auto and was undergoing surgery.
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"The blast wounded his leg, destroyed his vehicle and damaged the building", Hamas' Lebanon branch said in a statement.
Firefighters arrived to put out the flames and Lebanese security forces cordoned off the area.
A Hamas official in Sidon, Ayman Shanaa, told Palestinian television station Paltoday that Hamdan was "slightly wounded" in the attack.
The group has previously accused Israel of being involved in the assassination of a number of its members inside and outside Palestine.
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