The Lebanese army says it has dismantled two sophisticated Israeli spy systems planted in the mountains above Beirut.
The military said it was alerted to the long-range spying devices by the Shia militant and political group Hezbollah.
Meanwhile, an explosion in the Lebanese port city of Sidon late on Wednesday sparked media reports of a possible Israeli attempt to destroy a third device planted there.
Israel has denied any involvement.
The Israeli army issued a statement saying there was “no unusual [military] activity in the area”.
On Wednesday, the Lebanese Armed Forces released a statement saying they had located two sophisticated Israeli-made surveillance devices in the mountains of Sannine and Barouk, north and south of the capital Beirut.
Pictures on the army website showed devices concealed inside large fake rocks on the slopes of the mountains.
The system found in Sannine included a camera, a device to send images and a third to receive signals, the army said.
The device found in Barouk was “more complicated”, it said.
The system was placed at a height of 1,715m and overlooked the towns of the western and central Bekaa Valley, a number of towns in southern Lebanon, and parts of Syria. It had the ability to communicate with wireless transmission stations in Lebanon and the Palestinian territories, the army said.
More than 100 people in Lebanon have been arrested since last year on suspicion of collaborating with Israel.
In a speech late on Wednesday, Hezbollah leader Sheikh Hassan Nasrallah said underground Israeli spy radars were sending pictures “day and night”.
He told supporters that Hezbollah was ready to fight any Israeli attack on Lebanese sovereignty, despite internal divisions over a UN-backed tribunal investigating the 2005 assassination of former Lebanese Prime Minister Rafik Hariri.
Hezbollah fought a 34-day war against Israel in 2006 that left 1,200 Lebanese and 160 Israelis dead. Lebanon and Israel remain officially in a state of war.
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