A convoy carrying members of Hezbollah was hit by a roadside bomb near the Lebanese-Syrian border on Tuesday, injuring at least two people in the third attack on the Shi'ite militant group in six weeks, security sources said.
The sources said the convoy of two sport utility vehicles was heading towards the Syrian border crossing. A barrage of gunfire hit the convoy after the blast.
It was not immediately clear who was behind the attack, but Syrian Sunni rebel groups have threatened to strike Hezbollah in Lebanon following its military intervention in Syria on the side of President Bashar al-Assad.
The attack comes a week after a car bomb injured more than 50 people in a southern Beirut suburb controlled by Hezbollah, one of the most powerful political and military forces in Lebanon. In late May, rockets were fired at a Hezbollah area of southern Beirut.
Pictures from the scene showed black smoke rising from the targeted cars. The windscreen of one of the cars was smashed.
Several small roadside bombs have been set off near the Syrian border crossing in recent months.
Lebanon, which fought its own 15-year civil war, is struggling to stay on the sidelines of its larger neighbour's bloody conflict. Car bombs and sporadic clashes between groups supporting opposite sides of Syria's war have become increasingly common.