The strikes came just hours after the head of Lebanese Shiite movement Hezbollah threatened Israel after two drones fell on its Beirut stronghold in what he described as a targeted “drone attack”.
The National News Agency said “three hostile strikes” after midnight hit Lebanon’s eastern mountains near Qusaya town “where the Popular Front for the Liberation of Palestine [PFLP] – General Command has military posts”.
“They responded will a barrage of anti-aircraft fire,” it said.
PFLP-GC spokesman Anwar Raja told the Al-Mayadeen television channel that it was an Israeli strike.
The PFLP-GC has close ties to Hezbollah and the Syrian regime.
It has positions in the eastern region of Bekaa, as well as in Al-Naaemeh just south of Beirut.
Qusaya is only about five kilometres (three miles) from the Syrian border.
In July 2015, a security official said a blast at a PFLP-GC base there wounded seven people, while the Palestinian group blamed it on an Israeli strike.
On Sunday, Hezbollah chief Hassan Nasrallah threatened Israel after what he described as a targeted “drone attack” in a stronghold of his group in the south of Beirut.