The late yesterday raid was second such Syrian strike against the Sunni-majority border areas in less than a week.
"Syrian helicopters fired rockets at the Wadi Hmeid area near (the town of ) Arsal. There were no casualties," the Lebanese official said on condition of anonymity.
The attack was the latest in a series related to the escalating war in Syria, in which Lebanese Shiite movement Hezbollah has become fully engaged.
The latest raid comes soon after the Syrian town of Qusayr was captured by the regime army and Hezbollah fighters from the rebels after nearly three-weeks of fierce fighting.
More From This Section
Ever since the Syrian revolt erupted in March 2011, Arsal has become a key conduit for refugees and wounded people fleeing strife-torn Syria.
Security officials say the town has also served as a passageway for fighters and arms flowing into Syria.
Syria's civil war has exacerbated sectarian tensions in Lebanon, which is deeply divided between supporters and detractors of Assad's regime.