Israel shells Lebanon in response to rocket fire
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The rockets were fired from near the village of Seddiqine in the district of Tyre, the source said, without specifying who was responsible.
The Israeli army confirmed the attack, saying it retaliated with artillery fire.
"In response, IDF artillery are striking a number of targets in Lebanese territory," it said.
There were no immediate reports of any casualties.
It is the third time rockets have been launched from Lebanese territory towards Israel since hostilities flared between the Jewish state and armed Palestinian groups in the Gaza Strip last week.
Israel's massive bombardment of Gaza began on May 10, shortly after Hamas launched rockets towards Jerusalem in response to actions by Israeli police at the flashpoint Al-Aqsa mosque compound, Islam's third holiest site.