The British Embassy in Beirut announced that "the Foreign, Commonwealth & Development Office (FCDO) advises against all travel to Lebanon."

"If you are currently in Lebanon we encourage you to leave now while commercial options remain available," it said.

"If you are a British National in Lebanon, please register your presence which includes recording your up to date contact information.  You should fill in this  form for every member of your family or group who is a British National.  Your registration will allow us to share any updates," it added.

"Events in Lebanon are fast moving. The situation has potential to deteriorate quickly and with no warning."