Urgent calls grew for foreign nationals to leave Lebanon, which would be on the front line of a regional war, as Iran and its allies readied their response to high-profile killings blamed on Israel.

While diplomats worked to avert a feared conflagration, France's Emmanuel Macron and Jordan's King Abdullah II said Sunday a regional military escalation must be avoided "at all costs", the French presidency said after they held a telephone call.

Hezbollah said it launched a drone attack early Monday on northern Israel that the Israeli military said wounded two Israeli troops and set off a fire.

The violence came as fears of an all-out regional war mount following the killings last week of a senior Hezbollah commander in Lebanon and Hamas’ top political leader in Iran.

An Israeli drone strike near a cemetery in the southern village of Mays al-Jabal killed two people, a Hezbollah fighter and a paramedic.

The National News Agency said one of the dead was a member of the Islamic Risala Scout Association paramedic group. The group identified the member killed as Mohammed Fawzi Hamadi. Hezbollah later announced the death of one of its fighters, Ali Shuqair from Mays al-Jabal, "on the road to Jerusalem."

The UK government has urged its citizens in Lebanon to leave the country immediately, amid fears of all-out war between Israel and Hezbollah and a broader regional conflict.

The U S. embassy in Lebanon has urged its citizens to leave Lebanon on "any ticket available," amid fears of all-out war between Israel and Hezbollah and a broader regional conflict.

Hezbollah said overnight it had launched dozens of Katyusha rockets at northern Israel.

The Iran-backed group said its latest attack, on Beit Hillel in northern Israel, was in response to Israel's attacks on Kfarkela and Deir Siriane in south Lebanon which, it said, had injured civilians there.

Lebanon on Sunday marks four years since a catastrophic explosion at Beirut's port killed more than 220 people, with fears of all-out war between Israel and Hezbollah hanging heavy over the grim commemoration.

Several marches are set to converge on the port in the afternoon to remember the victims and demand justice.

France on Sunday called on its citizens in Lebanon to leave the country "as soon as possible" amid fears of all-out war between Israel and Hezbollah and a broader regional conflict.

"In a highly volatile security context, we once again call the attention of French nationals, particularly those passing through, to the fact that direct commercial flights and ones with stopovers to France are still available, and we invite them to make their arrangements now to leave Lebanon as soon as possible," the foreign ministry said in its travel advice notice for Lebanon.

Dozens of people gathered Friday in the village of Shamaa in southern Lebanon to mourn a Syrian refugee family killed in an Israeli strike that hit their house the day before.

The Lebanese health ministry said five Lebanese citizens were also injured in the strike, which killed a Syrian widow and her three sons — two children and one young adult.

Flights to Beirut by Air France and low-cost carrier Transavia France will remain suspended until at least Tuesday due to "security" concerns in the region, parent company Air France-KLM said on Saturday.