BEIRUT (AFP) - Three suspected Israeli spy devices have been blown up in south Lebanon, two detonated remotely by the Israeli army and one destroyed by the Lebanese army, a military official said on Sunday. One explosion occurred before midnight (2100 GMT) in a hilly part of the Hula border zone and a second happened in the same district (on Sunday) morning, the official told AFP. It seems the two detonations were triggered by Israel which exploded two spying devices it had planted in the sector a long while ago, she said. Israel feared for one reason or another that they might be discovered and proceeded to destroy them by exploding them remotely, the official said. Lebanese troops located another device and exploded it on Sunday morning after going to the area on Saturday night with UNIFIL peacekeepers, she added. A security official in south Lebanon told AFP the devices were used for surveillance of communications by the resistance, referring to the Hezbollah movement which fought a bloody 34-day war with Israeli in 2006 that devastated the south of the country. Yasmina Bouziane, spokeswoman for the UN peacekeeping force, confirmed that UNIFIL troops had deployed in the area but said she had no detailed information about what happened. The military official also said Lebanese anti-aircraft guns fired at an Israeli MK-type reconnaissance aircraft, which violated Lebanese air space, overlying the southern region of Bint Jbeil. The army fired because the aircraft was within range, she added. The Israeli army said the Lebanese allegations do not warrant a serious response. We will continue to act to maintain calm on Israels northern border. Hezbollah is once again trying to divert the attention of the international community from their continuous violations of UN resolution 1701. Todays incident proves Hezbollahs military presence in southern Lebanon, particularly in rural Shia areas near the Israeli border, the army said in a statement. Lebanon has repeatedly complained of violations of its air space by Israeli aircraft.