Hezbollah leader Hassan Nasrallah renewed his commitment on Friday to the battle in Syria, where the Shi'ite militant group has been fighting alongside President Bashar Assad's forces, saying he was ready to go himself if needed.

Nasrallah said Thursday's car bomb in Beirut would only reinforce Hezbollah's determination to fight in Syria and defeat radical Sunni Islamists he said were behind the attack. "If the battle requires me to go (to Syria) ... I will go," he said.

Nasrallah also said that radical Sunni Islamists were likely to have been responsible for the car bomb, which killed 24 people.  

Nasrallah said earlier attacks against the Iranian-backed group's base and other Shi'ite areas in Lebanon were the work of "takfiri" factions, in reference to Sunni radical groups linked to al-Qaida.

On Thursday, Lebanese President Michel Suleiman said Israel was behind the blast. "The fingerprints of the Israeli terrorism are all over it. Their goal is to destabilize the region and undermine the steadfastness of the Lebanese people." Druze leader Walid Jumblatt also attributed the blast to Israel, as did a former Hezbollah MP.