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By Emily Atkinson
BBC News
Three former Supreme Court judges are among the signatories of a letter warning that the UK is breaching international law by sending weapons to Israel.
They say arms sales must end due to the "plausible risk of genocide" in Gaza.
The prime minister is already facing growing cross-party pressure after the killing of seven aid workers by an Israeli strike in Gaza.
On Tuesday, Rishi Sunak said the UK has a "very careful" arms licensing regime.
Speaking to the Sun, he called for an independent investigation into the Israeli strike, 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.
Former Supreme Court president Lady Hale is among more than 600 lawyers, academics and retired senior judges who have signed a 17-page letter saying "serious action" was needed to "avoid UK complicity in grave breaches of international law, including potential violations of the Genocide Convention."
They added that the sale of weapons 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 KCs.
Britons John Chapman, James Henderson and James Kirby were working alongside food aid charity World Central Kitchen as security and safety advisors when their convoy was attacked from the air on Monday.
The other individuals killed in the strike were aid workers Lalzawmi "Zomi" Frankcom, an Australian national, American-Canadian dual citizen Jacob Flickinger, Polish national Damian Sobol and Palestinian Saifeddin Issam Ayad Abutaha.
Israeli Prime Minister Benjamin Netanyahu described the attack as unintended and "tragic", promising an independent investigation.
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.
"If it says there is a clear risk that UK arms might be used in a serious breach of international humanitarian law, it's time to suspend the sale of those arms," said shadow foreign secretary David Lammy.
He told reporters 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 whether arms sales to Israel should be stopped.
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".
Asked if he backed calls for arms sales to Israel to be suspended, the prime minister told the Sun: "We've always had a very careful export licensing regime that we adhere to. There are a set of rules regulations and procedures that we'll always follow.
"And I've been consistently clear with Prime Minister Netanyahu since the start of this conflict that whilst of course we defend Israel's right to defend itself and it's people against attacks from Hamas, they have to do that in accordance with humanitarian law, protect civilian lives, get more aid into Gaza."
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 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.
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 nevertheless add diplomatic and political pressure on Israel, at a time when its conduct in the Gaza conflict is coming under renewed international scrutiny.
Last week, a cross-party group of more than 130 MPs and peers wrote to Foreign Secretary Lord Cameron calling for an immediate suspension of export licenses for arms sales to Israel.
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.