The United States and Great Britain today urged their citizens to leave Lebanon amid growing fears of an all-out war between Israel and Hezbollah.

The United States Embassy in Beirut urged its citizens to book "every available airline ticket" to leave Lebanon.

Despite the cancellation of flights to Beirut, commercial transport options to leave Lebanon are still available, according to the embassy statement.

"We encourage those wishing to leave Lebanon to book any available tickets, even if that plane does not take off immediately or does not follow the desired return route," they added.

The British government has asked its nationals to leave Lebanon immediately while trade routes are still available.

"Tensions are high and the situation could deteriorate quickly. My message to British citizens is clear: 'Move now,'" said the head of British diplomacy, David Lammy.

The Foreign Office is also urging Britons in Lebanon to contact consular services there so authorities can keep them informed of developments.

London also indicates that military personnel will soon be deployed to the region to provide operational support to British embassies to assist British nationals.

Royal Air Force helicopters are also on standby in case of need.

Fears of a worsening situation have intensified in the region as Iran and its allies, including Lebanon's Hezbollah, have repeatedly issued threats against Israel, which they accuse of being responsible for the death of Hamas leader Ismail Haniyeh.