“The sovereign government of Lebanon fails to meet its commitments under UN Resolution 1701 because it does not prevent the firing of rockets against our territory,” deputy foreign minister Danny Ayalon told public radio.

He also accused Lebanon of “turning a blind eye” to arms transfers to the Shiite Hezbollah militia, which fought Israel to a bloody stalemete in the summer of 2006.

“The Lebanese government is in formation, but there is a transitional government that must assume its responsibilities, and our ambassador to the UN, Gabriela Shalev, has complained to the Security Council,” Ayalon said.

“For now, our punctual response in the field is sufficient. But this isolated incident demonstrates the terrorists’ potential, and Israel will respond massively if the calm is seriously broken.”

UN peacekeepers were monitoring the Lebanese border with Israel on Saturday, a day after rockets launched from south Lebanon slammed into Israel’s Galilee region, but the situation was “calm,” a spokeswoman said.

The rockets triggered retaliatory artillery fire across the border.

Hezbollah denied responsibility for similar attacks earlier this year but has not yet commented on Friday’s incident.

In 2006 Israel and Hezbollah fought a devastating 34-day war after militants abducted two Israeli soldiers in a deadly cross-border raid.

More than 1,200 people were killed in Lebanon, most of them civilians, along with 160 Israelis, most of them soldiers.

It was ended by the adoption of UN Security Council resolution 1701, which demanded the disarming of all militant groups in Lebanon, including Hezbollah, and an end to arms smuggling across its borders.

In July, the explosion of a huge arms cache in south Lebanon prompted another Israeli complaint to the UN Security Council.

A UN investigation found that the cache was probably actively maintained by Hezbollah in violation of the ceasefire resolution but found no evidence to back Israeli charges that the weapons and ammunition had been smuggled into Lebanon after the 2006 conflict.