LONDON: Britons in Tel Aviv have recounted the 鈥渇rightening鈥� ordeal of sheltering from missile attacks after Israel faced days of deadly Iranian salvos.

, three Brits stranded in the country demanded that the UK government organize urgent repatriation flights.

On Monday, the British government said it was setting up a 鈥淩egister Your Presence Portal鈥� for British nationals in Israel.

According to the BBC, British officials want a clearer picture of who is in the region and who may need assistance. They have urged people to sign up to it once it is up and running, which is expected to be on Monday.

Zach Margolin, a 31-year-old online comedian, said on Sunday: 鈥淚t鈥檚 really frightening. We could hear enormous explosions; we could hear the Iron Dome flying up and then the building shaking. Last night was the most I鈥檝e seen, it鈥檚 proper explosions.鈥�

He had flown to the Israeli capital on June 4 for his birthday and to produce content for social media.

But after Israel鈥檚 June 13 attack on Iran and Tehran鈥檚 subsequent retaliation, Margolin is now one of thousands of Brits stranded in the country.

He had booked three flights on June 18, 19 and 20 to give him the best chance of returning home.

On the first night of Iran鈥檚 retaliation on Friday, he fled his apartment for safety at 10 p.m., 1 a.m. and 5 a.m. after hearing air raid sirens.

Tehran鈥檚 missile forces had launched more than 100 ballistic missiles and drones at the Israeli capital in response to the Israel Defense Forces鈥� 鈥淥peration Rising Lion.鈥�

Margolin said: 鈥淵ou鈥檇 be crazy not to be afraid. I鈥檝e been to Israel many times during sirens, and the usual protocol is you go in the shelter, wait 10 minutes and then go out, but this is a different beast.

鈥淚t鈥檚 not one missile from Yemen or rockets from Gaza, it鈥檚 hundreds of ballistic missiles coming from Iran.鈥�

Iran鈥檚 retaliatory salvos killed at least 13 people in the first two nights of strikes.

Israel closed its airspace in response, as well as land routes out of the country.

鈥淚deally the UK government should be putting on a repatriation flight,鈥� Margolin said. 鈥淭he only update (from the Foreign Office) is don鈥檛 go to Israel.鈥�

The Foreign Office later warned that the situation could 鈥渄eteriorate further, quickly and without warning,鈥� and advised against all travel to Israel and the Occupied Palestinian Territories, placing the two on the same level of advice as Iran.

James Eden, a 72-year-old retired accountant, had flown to Israel last week for a Christian pilgrimage.

He told The Times that he was considering escaping the country via bus through the Negev desert, in an attempt to reach Egypt.

鈥淭he (Foreign Office) rang me and said there wasn鈥檛 a lot they could do,鈥� he added.

鈥淭hey鈥檙e not going to stop me (leaving by land) 鈥� but they鈥檙e not going to help me get out of Egypt either.鈥�

Posts on social media platforms have advertised opportunities to reach the Egyptian Red Sea resort city of Sharm El-Sheikh from Israel, in order for Britons to catch safe flights home.

British father-of-two Max Radford, 52, feared that his time in Israel would be 鈥渋ndefinite鈥� as he urged the UK government to move repatriation aircraft to its bases on Cyprus, to prepare for quick evacuation flights from Tel Aviv.

鈥淭here is absolutely no question that the British government should be putting on repatriation flights,鈥� he said. 鈥淭hey should know that there are thousands of Brits here that are stranded. They need to do something. There is no airline that can do it.鈥�

Radford added: 鈥淚 had a very nearby explosion the night before last when I was in Tel Aviv. 鈥淵ou never know what comes next; we鈥檝e no idea about tonight and we really don鈥檛 know how long we鈥檙e here for. It鈥檚 kind of indefinite.鈥�

UK Foreign Secretary David Lammy told British nationals in Israel that their safety 鈥渞emains our top priority.鈥�

He said: 鈥淢y message to British nationals there is clear: your safety remains our top priority. Follow our travel advice for the latest updates.鈥�