A car bomb struck a stronghold of the Shia armed group Hezbollah in eastern Lebanon, injuring both civilians and members, Lebanon's state-run news agency said.
The National News Agency (NNA) reported that Tuesday's blast near the remote village of Sbouba in the Baalbek region "was caused by a suicide bomber".
Beirut-based The Daily Star daily said the suicide bomber drove an explosives-laden vehicle into two vans carrying Hezbollah members.
Hezbollah's Al-Manar TV confirmed the blast, adding that the attack took place near a Hezbollah transit point hub.
There was no immediate word on the nature of the explosion or the target.
Al Jazeera's correspondent in Lebanon said 10 were injured in the attack.