The UK embassy in Beirut advised its nationals to exercise extra vigilance and care, urging to minimize their movements given "the high threat from terrorism".

In its latest travel advice, the Foreign and Commonwealth Office warned that the security situation in parts of Lebanon can deteriorate quickly, calling on British national to keep up to date with developments, be vigilant, follow local advice and avoid any protests or demonstrations.

"There is potential for further violence, which could restrict departure options. The ability of the British government to provide assistance with departures may be limited," reads a statement posted on the embassy's website.

"There is a high threat from terrorism. There is a high risk of attacks by Islamist extremist groups, which could be indiscriminate and affect Lebanese security authorities, checkpoints and places visited by foreigners like hotels, restaurants, tourist sites western-style shopping centres and supermarket chains," it added.

The statement pointed out that security authorities are at a high state of alert and conducting security operations across Lebanon, warning that attacks could take place in areas not previously targeted.

"If you notice that a security operation is underway you should immediately leave the area," the statement stressed. "Further attacks are highly likely."

The embassy advised British citizens to exercise extreme vigilance, monitor media reports and keep up to date with the travel advice covering your location.

"Avoid large crowds, demonstrations, political gatherings and the use of shared public transport. Remain alert to regional tensions given Lebanon’s links and proximity to Syria, and to the potential for sectarian attacks. Keep clear of affected areas in the immediate aftermath of any attacks," it mentioned.

The statement advised against all travel to:

• Tripoli
• Palestinian refugee camps
• within 5km of the Syrian Border
• the Hermel Area, including Arsal, Baalbek
• the Bekaa Valley east of the Baalbek El Hermel High Way to the Syrian border and down to En Nabi Chit
• southern suburbs of Beirut east of the airport road, defined as: south of the sports stadium to the airport, to east of the main airport highway including the neighbourhoods of Ghobeiry, Chuya, Haret, Hraik, Burj Al Brajne, Mraije, Er Rouais and Laylake
• southern suburbs of Beirut west of the airport road, defined as: west of the airport highway to the coast, south from Adnan El Hakim Road to Abbas El Mousawi Road.

 It also advised against all but essential travel to:

• Bekaa Valley west of the Baalbek El Hermel High Way
• Saida