Tank-led Israeli troops pushed 5 miles north of Israel's self-declared "security zone" in southern Lebanon Friday just hours after soldiers killed three Palestinian guerrillas attempting to infiltrate into Israel, security sources said.

The sources said some 600 Israeli troops, backed by 30 tanks and a hail of artillery fire, advanced toward the village of Mimes, 13 miles north of the Israeli border and took up positions in and around the village.In Jerusalem, a spokesman of the Israeli Defence Forces denied the report.

There were no reports of clashes between Syrian-backed leftist and Palestinian guerrillas active in the area and the Israeli force, the sources said, but at least three civilians were wounded when Israeli shells hit nearby villages.