organisation said in a statement on Tuesday that it had discussed two complaints by Lebanon and two from Israel over alleged violations of the April, 1996, ceasefire. Israel occupies a so-called security zone in south Lebanon and uses its own troops as well as Lebanese militia proxies to exert control of the area. Lebanon`s mainly Shi`ite Moslem guerrillas launch hit-and-run attacks in an effort to force Israel to end its occupation. Lebanon and Israel are still technically at war and south Lebanon is the last active Arab-Israeli war front. The monitors said Lebanese guerrillas fired mortar bombs near houses last Thursday and the same day they fired a round that damaged vehicles. The statement said the Lebanese delegate said precautions would be taken against further incidents. It added that on Sunday, "shells fired by Israel and those cooperating with it" in separate incidents hit two Lebanese villages, injuring two civilians and damaging houses and other property. The Israeli delegate said the shelling was "unintentional" but that Israel would "take additional precautions in order to avoid such incidents in civilian populated areas." The international group, which has Israeli, Lebanese, Syrian and U.S. members, monitors the 1996 ceasefire agreement reached after an Israeli offensive that killed about 200 Lebanese nationals, most of them civilians. The agreement does not ban attacks on military targets by Lebanese guerrilllas trying to end Israel`s 20-year-long occupation of the border area.