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"An intense Israeli build-up of forces during the past 24 hours has been observed along the eastern sector of the Blue Line, with mobile and fixed patrols," said NNA.
It added that "Israeli tank emplacements were spotted amid intense overflights by helicopter gunships and warplanes."
"Earlier, an Israeli mechanized infantry unit comprised of two Hummers crossed the UN-designated Blue Line for 300 meters in the direction of the occupied part of al-Ghajar village," said NNA.
On the Lebanese side, UN Interim Force in Lebanon (UNIFIL) and Lebanese army personnel intensified patrolling activities.
The Blue Line, which is the line for Israeli withdrawal from south Lebanon in 2000, now serves as the borderline of the two countries and runs through the middle of the al-Ghajar village.
Lebanon accuses Israel of intruding its airspace on a daily basis, saying it is a violation of UN Security Council Resolution 1701. The resolution put an end to the 2006 war between Israel and Lebanese Shiite armed group Hezbollah, and mandates peacekeepers to monitor the armistice along the border.