Lebanon's army said on Tuesday it fired at four Israeli warplanes which flew at low altitude over south Lebanon.
"The army's anti-aircraft guns fired in the direction of four Phantom-type enemy Israeli planes that had been overflying the (southeastern) Hasbaya region at low altitude since this (Tuesday) morning," an army spokesman told AFP.
U.N. peacekeepers and Lebanon say Israeli flights over the country violate Security Council Resolution 1701 that ended a 34-day war between Israel and Hezbollah guerrillas in 2006.
The army publishes almost daily reports of Israeli violations of Lebanese air space. But it rarely opens fire unless the Israeli planes fly within range of its guns.
An spokesman for the Israeli army said it was checking the report of the incident.
Israel relies heavily on air supremacy and its air raids destroyed large districts of the Hezbollah-dominated southern suburbs of Beirut and several towns and villages in south Lebanon during the 2006 war.
Hezbollah has said it has the right to acquire air-defense weapons and to use them against Israeli warplanes.