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.

Iran said on Saturday it expects Lebanon's Tehran-backed Hezbollah to hit deeper inside Israel and no longer be confined to military targets after Israel killed the Hezbollah military commander.

As Hezbollah's leader threatened Israel with crushing retaliation for killing their top commander, thousands in Beirut flocked to a dance extravaganza in a stark illustration of Lebanon's deep divisions.

In the capital's southern suburbs -- a Hezbollah stronghold -- tens of thousands of black-clad women and men in military uniform joined Thursday's funeral procession for slain commander Fouad Shukur.

Sweden said Saturday it was shutting its embassy in Beirut amid fears the war in Gaza could escalate into a region-wide conflict, after urging thousands of its citizens to leave Lebanon.