Anti-aircraft missiles were fired at an Israeli drone flying over south Lebanon on Wednesday but did not hit the target, the Israeli military spokesman said.
Two Lebanese security sources said Lebanon's Hezbollah armed movement fired at the drone. One of the sources said the missile did not hit the aircraft, which then returned across the border.
The IDF Spokesperson's Unit said anti-aircraft fire was detected from Lebanese territory aimed at a remotely manned aircraft during routine operations over Lebanese territory. The UAV was not hit and continued its mission, said the military.
Witnesses said they heard the sound of an explosion. Local channel NBN had said earlier that a drone blew up.
Iran-backed Hezbollah, which has a dominant presence in the south near the border, has vowed to bring down Israeli drones breaching Lebanese airspace. The two neighbouring enemies last fought a month-long war in 2006.
Earlier this week, Hezbollah said it had brought down an Israeli drone, while Israel's military said the aircraft had fallen inside Lebanon.
Hezbollah's al-Manar TV said the drone was shot down after it entered Lebanon's air space and crashed in the village of Blida, near the border with Israel. Hezbollah fighters have the unmanned aircraft, the report said.
The Israeli military said the drone was on operational activity along the border before it crashed. "There is no risk of breach of information," the military added.
Lebanon's government regularly files complaints to the United Nations against Israeli drones and jets that often fly into Lebanon.
Associated Press contributed to this report