Israeli forces trade fire with militants at Lebanon border

South Lebanon comes under Israeli fire

MOUNT DOV, Israel (CNN) -- The Israel Defense Forces said Monday several of its positions on Mount Dov in northern Israel had come under artillery fire from Lebanon, and its troops were firing back.

An IDF spokesman said while some Israeli positions had been hit by artillery shells, no injures were reported.

Earlier Monday, the IDF said it is sending more forces to its northern border with Lebanon in an attempt to control cross-border attacks from Hezbollah militants.

The recruitment of more Israeli reserve units is due to "the worsening characteristic of activities initiated by the Hezbollah and the possible deterioration in the sector," said the IDF statement, released on Monday.

A spokesman for the IDF office would not disclose how many troops were being called up but said their recruitment would be immediate.

IN-DEPTH  CNN NewsPass Video    •  Palestinian politics  MORE STORIES   •  IDF: Arms workshops destroyed in Rafah  EXTRA INFORMATION   •  Gallery: Palestinian fatalities  RESOURCES   •  Victims of terror   •  TIME.com: Orchestrating a common ground

CNN's Brent Sadler said the Hezbollah attacks from southern Lebanon are thought to be partly in response to Israeli incursions in the West Bank. (Full story)

In Lebanon on Sunday, a U.N. envoy urged restraint after Israel launched heavy air attacks against suspected Hezbollah hideouts in southern Lebanon in response to artillery and mortar fire against Israeli military positions near the Golan Heights.

For the second straight day, suspected Hezbollah guerrillas fired mortar shells and anti-tank missiles at Israeli army outposts in the district of Shebaa Farms at the foot of the Israeli-occupied Golan Heights, an Israeli military spokesman said. No casualties were reported.

The IDF also reported an attack from Lebanon by unidentified gunmen Sunday toward a kibbutz in northern Israel.

Earlier in the day, Lebanese authorities arrested three Palestinians for a shooting attack Saturday aimed near Ghajar village, near the southern Golan Heights. Another Palestinian involved in the attack was still at large.

Hezbollah claimed responsibility for a second attack on the same area Saturday.

Staffan de Mistura, U.N. special envoy for south Lebanon, told reporters: "We sincerely hope and want to believe that this is not at all a point of no return.

"That's why we are appealing to both the Lebanese authorities and to the Israeli authorities to exercise once again restraint."

Mistura said U.N. officials were concerned because there were more than 33 aerial bombings into Lebanese territory in retaliation for Saturday's attacks.

"That should give us a feeling of the special danger of the moment," he said.

Mistura said there have been violations of the so-called Blue Line during the past 10 days. The United Nations drew the line two years ago to mark the border between Lebanon and Israel after the Jewish state withdrew its troops from southern Lebanon following a 22-year occupation.