A Palestinian militant group in Lebanon said one of its bases south of Beirut has been hit by an Israeli rocket.
It is said to have caused no injuries or significant damage, Lebanon's Al-Manar Television reported.
The station quoted a spokesman for the Popular Front for the Liberation of Palestine-General Command as saying the group's base in Na'ameh was attacked.
The spokesman said the PFLP-GC was surprised it was targeted because the earlier rocket fire was claimed by a separate al-Qaeda-linked Sunni Muslim group.
A Lebanese security source confirmed that a rocket hit an area near Na'ameh, south of the Lebanese capital Beirut, near a network of tunnels used by the PFLP-GC in hills overlooking the Mediterranean coast.
He said the rocket caused a five-metre crater, but no casualties.
An Israeli spokesman had said the Israeli air force bombed a militant target in Lebanon in retaliation for a cross-border rocket salvo yesterday.