The UNIFIL peacekeeping force in Lebanon said its preliminary probe into two explosions in the south showed they had been caused by the detonation of underground sensor devices.
The units were apparently buried by Israeli forces during the 2006 war with the Lebanese Shi'ite group Hezbollah, it said.
"These do look like some sort of espionage device," Michael Williams, the U.N. special coordinator for Lebanon, told Reuters.
If confirmed, the devices would represent violations of Security Council resolution 1701 which halted the 34-day war.
A first explosion was reported on Saturday evening and a second on Sunday morning. No injuries were reported. The devices had been placed some 2 km inside Lebanese territory between the villages of Houla and Meiss al-Jabal.
"Preliminary indications are that these explosions were caused by explosive charges contained in unattended underground sensors which were placed in this area by the Israel Defence Forces (IDF) apparently during the 2006 war," UNIFIL said in a statement.
UNIFIL was investigating what had caused the devices to blow up. A Lebanese security official said they appeared to have been detonated by remote control from Israel after their discovery by Lebanese security forces.
Israel did not respond specifically to the Lebanese assertion. But an Israeli military statement said Sunday's incident proved Hezbollah's military presence in south Lebanon, especially in rural Shi'ite areas along the border with Israel.
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See also Sydney Irresistible
Putting principles before profits
See also Sydney Irresistible
Putting principles before profits
