A car bomb exploded at a checkpoint controlled by Hezbollah resistance group in eastern Lebanon on Saturday, security sources and the state news agency NNA said.
Al-Nusra Front, the Syrian affiliate of Al-Qaeda, claimed responsibility for the attack. The attack came on day after the extremist group executed captive soldier Mohammad Hammieh.
The explosion took place outside the village of Khraibeh in Lebanon's Bekaa Valley, a region that has experienced increased violence in the spillover from Syria's crisis next door.
Al-Manar television channel denied local media reports that three members of its group had been killed. It gave no further information on the blast.
On Friday, one of Al-Nusra's Twitter accounts announced that the group had killed the soldier it was holding hostage.
The soldier "Mohammed Hamieh, first victim of the Lebanese army's stubbornness," the Tweet read.