Reuters has called on Israel to conduct a quick and comprehensive investigation into cross-border fire that killed one of its journalists and wounded other reporters in Lebanon last week.

Video journalist Issam Abdallah died and six other journalists were injured -- including two from AFP -- in firing near the village of Alma al-Shaab in southern Lebanon on Friday.

Israel shelled Tuesday border areas in south Lebanon after three anti-tank missiles were fired from Lebanon, causing casualties on the Israeli side.

Three Israelis were injured, one of them critically wounded, Israeli reports said, as Israel shelled with artillery al-Khiam, Hamames, Kfarkela, Rmeish, Markaba, Aitaroun, and al-Bustan's outskirts.

Iran has warned of a possible "pre-emptive action" against Israel "in the coming hours", as Israel readies for a ground offensive on the Gaza Strip.

Tehran has repeatedly warned that a ground invasion of the long-blockaded Gaza would be met with a response from other fronts -- prompting fears of a wider conflict that could draw in other countries.

Israel has been bombing Gaza since Palestinian militants launched their attack but tensions have also flared on the northern border with Lebanon, the base of another sworn enemy, Hezbollah.

Hundreds of Israelis have left villages and kibbutzim near the tense, U.N.-patrolled frontier with Lebanon following cross-border fire that has become more deadly as tensions have heightened.

Swiss International Air Lines is suspending flights between Switzerland and Beirut initially until October 28 due to unrest on the border between Lebanon and Israel.

"SWISS places top priority on the safety of its passengers and crew," the flag carrier said in a statement.

Lebanese authorities should take all necessary measures to avert a war with Israel, France's foreign minister said in Beirut, following repeated exchanges of fire along the shared frontier.

Catherine Colonna spoke on Monday hours after Israel and Lebanon's Hezbollah movement again traded cross-border fire, adding to tensions and fears of a wider war, 10 days into fighting between Gaza-based Hamas and Israel.

The Israeli army on Monday fired artillery shells at the outskirts of the Lebanese border town of Dhayra after Hezbollah attacked military posts on the frontier.

In a statement, Hezbollah said its fighters attacked five Israeli military posts with "the right and appropriate weapons." It also said that the group achieved "certain hits."

Israeli Prime Minister Benjamin Netanyahu warned Monday Iran and Hezbollah not to "test" Israel in the north.

"I tell Iran and Hezbollah not to test Israel or else they will pay a huge price," Netanyahu said, adding that Israel is prepared for a war on the northern front.

A five-story building collapsed Monday in the northern Metn town of Mansourieh, trapping several residents under the rubble.

Civil Defense chief Raymond Khattar said three residents were rescued unhurt while two were still under the rubble. MP Razi al-Hajj meanwhile said he has a list with the names of six citizens and a foreign domestic worker who are still under the rubble according to his sources.

The Lebanese army said Monday search operations have led to the discovery of 20 rockets launchers near the Lebanon-Israel border.

The army said in a statement that four of the launchers discovered had rockets inside them and were ready to be fired.