An explosion wounded seven people at the base of a Palestinian terrorist group linked to Syria's Assad regime in eastern Lebanon on Wednesday, a security official told AFP.
The explosion rocked a position in the town of Qusaya of the Popular Front for the Liberation of Palestine - General Command (PFLP-GC), a hardline group with close ties to the Syrian regime.
The official, who said the base was being used to store ammunition, said the blast was caused by "a rocket fired from Syrian territory."
The PFLP-GC confirmed the incident, but said it was caused by an Israeli air attack.
"Israeli planes struck a PFLP-GC military position on the Lebanese-Syrian border... wounding six of our fighters and hitting our ammunition depot," a statement read.
Qusaya is in eastern Lebanon, only about five kilometers (three miles) from the border. Across the frontier, clashes have been raging in the town of Zabadani between rebels and forces loyal to Damascus.
The incident follows an alleged Israeli airstrike in Syria earlier Wednesday, which left up to five pro-regime fighters dead. According to some reports Hezbollah child-killer Samir Kuntar was among the dead.