UNITED NATIONS (AP) - Israel urged the Lebanese government and U.N. peacekeepers on Monday to prevent Hezbollah militants and their supporters from violating its territory and jeopardizing the fragile stability along the border.

In identical letters to Secretary-General Ban Ki-moon and the Security Council, Israel’s U.N. ambassador also accused Hezbollah of violating a council resolution by building new military facilities and hiding arms in the zone between the Litani River and the Israeli border.

The resolution, which ended the inconclusive 34-day war between Hezbollah and Israel in 2006, put the zone under the control of 15,000 Lebanese troops and a 13,300-member U.N. peacekeeping force. It prohibited Hezbollah from engaging in military activities in south Lebanon and banned weapon smuggling to the group.

The region has been relatively quiet since the war although Hezbollah has boasted that it has returned to border areas, maintaining a clandestine presence.

Israeli Ambassador Gabriela Shalev cited three recent incidents that she said were "severe violations" of the U.N. resolution.

In the first, on July 14, a Hezbollah arms cache exploded in an abandoned building in Khirbet Silim, about 9 miles (15 kilometers) from the Israeli border, she said. Hezbollah has remained silent.

Three days later, 15 Lebanese civilians crossed the U.N.-drawn Blue Line - the unofficial boundary with Israel - and penetrated 175 meters (yards) into Israel, planting three Hezbollah and Lebanese flags before crossing back into Lebanese territory, Shalev said.

The July 17 incident took place near a position manned by U.N. peacekeepers, but Shalev said the force, known as UNIFIL, "refrained from taking any action to prevent the crossing of these individuals into Israeli territory." She noted that Qassem Hashem, a member of the Lebanese parliament who helped organize "the illegal action," claimed it was coordinated with relevant authorities including UNIFIL.

"Given the proximity of the violation to a UNIFIL position, Israel would have expected that UNIFIL intervene in time to prevent this violation," Shalev said.