"serious action" is needed to "avoid UK complicity in grave breaches of international law, including potential violations of the Genocide Convention".
The family of James Henderson say weapons sold to Israel "may in turn be used to kill our fellow citizens."
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Arms sales to Israel: Top judges urge UK to halt weapons trade
7 minutes ago
By Emily Atkinson,BBC News
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Reuters
Three former Supreme Court justices have joined more than 600 legal experts in calling for the UK government to end weapons sales to Israel.
In a letter to Prime Minister Rishi Sunak, they say arms exports must end because of the "plausible risk of genocide" in Gaza.
Mr Sunak is already facing growing cross-party pressure after seven aid workers were killed by Israeli forces.
On Tuesday, he said the UK has a "very careful" arms licensing regime.
British sales are lower than those of other countries, including Germany and Italy, and dwarfed by the billions supplied by its largest arms supplier, the United States.
But a UK ban would add diplomatic and political pressure on Israel, at a time when its conduct in the Gaza conflict is coming under renewed international scrutiny.
Former Supreme Court president Lady Hale is among more than 600 lawyers, academics and retired senior judges who have signed a
17-page letter.
It says "serious action" is needed to "avoid UK complicity in grave breaches of international law, including potential violations of the Genocide Convention".
It adds that the sale of arms and weapons systems to Israel "falls significantly short" of the government's obligations under international law.
Other signatories include former Supreme Court justices Lord Sumption and Lord Wilson, along with nine other judges and 69 senior barristers.
Reuters/World Central Kitchen
John Chapman, James Kirby and James Henderson were working as security and safety advisors
The growing calls for the suspension of UK export licences comes after seven aid workers - including three British citizens - were killed in a series of air strikes in Gaza on Monday.
Australian, Palestinian, American-Canadian, and Polish nationals were also killed. The group had just unloaded more than 100 tonnes of food aid.
Speaking
to the Sun newspaper after the incident, Mr Sunak called for an independent investigation, but stopped short of saying arms sales should end.
He added that the UK had been "consistently clear" with Israel that it must follow international humanitarian law.
Israeli Prime Minister Benjamin Netanyahu has described the attack as unintended and "tragic", and promised an independent investigation.
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Contains upsetting scenes.
Watch: Video shows World Central Kitchen vehicles destroyed in Gaza air strike
The UK has licenced arms to Israel worth over £574m since 2008, when official country-level data was made available, according to pressure group Campaign Against Arms Trade (CAAT).
Business Minister Greg Hands has previously told MPs the figure for 2022 - £42m - represented 0.02% of Israel's military imports that year.
Arms export licences, which are granted by the business department, cannot be issued if there is a clear risk the weapons could be used in a serious violation of international humanitarian law.
The Labour Party has not called for a suspension, but is urging the government to publish internal legal advice on whether Israel is in breach of international law.
Shadow foreign secretary David Lammy said there was "precedent" for suspending sales. Former PMs Margaret Thatcher and Tony Blair both took the move, in 1982 and 2002 respectively.
The SNP is calling for Parliament to be recalled from its current Easter break, ending on 15 April, to debate the issue.
Conservative MP Paul Bristow said the idea British-made arms could be used in action that kills innocent civilians in Gaza "turns the stomach," adding that the deaths of British aid workers "must be a line in the sand".
But his fellow Tory MP and former home secretary Suella Braverman rejected the idea of a ban, telling the BBC "we owe it to Israel to stand with them".
Speaking during a trip to Israel, she said: "I think that it would be a tragic shame if we were to walk away from our closest ally in this region".
Much of the Gaza Strip has been devastated during the Israeli military operations that began after Hamas gunmen attacked southern Israel on 7 October, killing about 1,200 people and seizing 253 hostages.
About 130 of the hostages remain in captivity, at least 34 of whom are presumed dead.
More than 32,916 people have been killed in Gaza since then, the Hamas-run health ministry says.
