Over 10 British citizens have been feared dead or missing in Israel after the weekend’s attack by Hamas.
Nathanel Young, who was serving with the Israel Defence Force, is the only Briton confirmed to have died.
BBC understands photographer Dan Darlington is thought by his family to be dead.
Over 700 people have been killed in Israel since Hamas launched its attacks Saturday morning.
The casualty includes 260 at a music festival where Briton Jack Marlowe was providing security. He has been reported missing.
Bernard Cohen, from Glasgow, has also been identified by family members on social media as having been killed in the attack.
The north London school attended by Young, who was 20, is “devastated” by his death, its headteacher has said.
He went to the same school – North London’s JFS Jewish School – as 26-year-old Marlowe.
Marlowe was reported missing from the Supernova music festival near Kibbutz Re’im, close to the Gaza border, which came under attack from Hamas militants.
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JFS headteacher Dr David Moody said: “We are heartbroken at what has happened.
“Nathanel is fondly remembered within the school and we think of him with nothing but love. Equally, we have seen reports that Jake Marlowe is missing and we all pray that he is found soon.”
He continued: “As a school of 2,000 pupils we have stood together in prayer this morning and I know that the thoughts of every staff member and every student are with both families at this horrific time.”
The UK government believes around 50,000 to 60,000 British nationals are in either Israel or Gaza.
It has said it is assisting the families of several individuals in Israel and in the Israeli-occupied West Bank and Gaza Strip.
The Foreign Office has advised against all but essential travel to the region due to the conflict.
Prime Minister Rishi Sunak is holding an emergency Cobra meeting later after days of escalating violence.
Sunak said the UK government was working “very closely” with its Israeli counterparts to “establish the status of any British nationals on the ground”.
He called the scenes from Israel “horrifying” and said “Hamas and the people who support Hamas are fully responsible for appalling acts of terrorism – call it out for what it is”.
The government has no plans for a UK-facilitated evacuation of British citizens from Israel, with those in need of support advised to contact the Foreign Office.