It is understood that the Foreign, Commonwealth and Development Office is in contact with and assisting the families of several people in Israel and the Occupied Palestinian Territories.
Mr Marlowe’s mother told the Jewish News her son was working as part of the security team at the dance festival near Re’im – a village close to the Gaza border.
“He was doing security at this rave and called me at 4.30am to say all these rockets were flying over,” she said.
“Then, at about 5.30am, he texted to say, ‘signal very bad, everything OK, will keep you updated I promise you,’ and that he loves me.”
She said her son lived in Ma’alot, in northern Israel, having moved to the country permanently two years ago.
Other people at the festival told Israeli media how the music was interrupted by air raid sirens, before Hamas militants opened fire.
“The music stopped and there was a rocket siren,” a woman told Israel’s N12 News.
“Suddenly, out of nowhere, they started shooting.”
Another party-goer, Esther Borochov, said a car rammed her vehicle as she tried to escape.
She said she played dead until Israeli soldiers arrived: “I couldn’t move my legs,” she told Reuters news agency.
“Soldiers came and took us away to the bushes.”
Meanwhile, German media reported that German citizen Shani Louk is among those missing.
The fate of the young woman, who is reported to have been kidnapped by Hamas militants, has not been confirmed.
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Corporal Nathanel Young, 20, from London, was a soldier in the 13th Battalion, according to the Israeli Defence Forces.
He was living in a home for lone IDF soldiers in Raanana, north of Tel Aviv, according to the Jewish News.
His family said on Facebook they were “heartbroken” and that he had been killed “on the Gaza Border yesterday [Saturday].”
Soldiers and civilians kidnapped
The Israeli embassy to the US said women and children were among more than 100 soldiers and civilians kidnapped by Hamas fighters and that active hostage situations were “ongoing”.
Tzipi Hotovely, Israel’s ambassador to the UK, told Sky News on Sunday that her country was “doing everything to make sure all the people being kept hostage at the moment in the hands of Hamas will be released”.
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‘We woke up to a nightmare’
Ms Hotovely said Israel had woken to a “nightmare” after Hamas launched its surprise attack on Saturday.
She said 300 Israelis were “brutally, barbarically murdered in cold blood” by people who planned the most “calculated way” to invade.
Children were taken from their homes to Gaza, while people with dementia were “taken hostage”, she added.
Some 350 Israelis have been killed, according to Israeli media, in the deadliest attack on the country in decades, while the health ministry said at least 1,590 people had been injured.
An Israeli military official said “hundreds” of Hamas militants had been killed and dozens captured in retaliatory attacks.
The Palestinian health ministry said on Sunday morning that at least 313 people had died, including 20 children, and that nearly were 2,000 wounded in Gaza, with seven people, including a child, killed by Israeli army fire in the West Bank.