The UK has suspended some arms sales to Israel, saying there is a “clear risk” the equipment could be used to commit serious violations of international law.

Foreign Secretary David Lammy said the UK will be suspending 30 out of 350 arms export licences to Israel.

The affected equipment includes parts for fighter jets, helicopters and drones.

Mr Lammy said the UK continued to support Israel’s right to defend itself, and this did not amount to an arms embargo.

Israel’s Defence Minister Yoav Gallant posted on X to say he was “deeply disheartened” by the move, while Foreign Minister Israel Katz said it sent a “very problematic message” to Hamas and Iran.

Mr Katz added that Israel operated according to international law.

Western governments have been coming under growing pressure to halt arms sales to Israel over how it is waging the war against Hamas in the Gaza Strip.

The foreign secretary said many MPs, lawyers and international organisations had raised concerns about British arms export licensing to Israel.

He immediately sought a review of British arms exports to Israel after the Labour government took office in July, Mr Lammy added.

He said the review did not and “could not arbitrate on whether or not Israel has breached international humanitarian law” – and this was “not a determination of innocence or guilt”.

But he said the government had its own legal duty to review all exports licences.

Mr Lammy said: “The assessment I have received leaves me unable to conclude anything other than that for certain UK arms exports to Israel, there does exist a clear risk they might be used to commit or facilitate a serious violation on international humanitarian law.”

He said the partial ban covered items “which could be used in the current conflict in Gaza”.

But parts made in the UK for the F35 fighters that Israel is using to strike targets in Gaza will not be included in the UK’s ban.

The decision is more significant politically than militarily – UK arms sales to Israel are small, just 1% of the country’s defence imports.

The US is by far the biggest supplier of arms to Israel, accounting for 69% of its imports of major conventional arms between 2019 and 2023, according to the Stockholm International Peace Research Institute.

But it is still striking that one of Israel’s closest allies has judged there is a clear risk the country may use some of its arms exports to violate international humanitarian law.

The announcement may come as no surprise to the government of Israel – it has been long-flagged – but it will still hurt.

The discussion about suspending arms sales began under the last Conservative government but it has come to a head under the new Labour administration.

The Labour government has called for an immediate ceasefire in the war between Israel and Hamas, the release of all hostages and an increase in the amount of aid to civilians in Gaza.

Some backbench Labour MPs have been urging Prime Minister Keir Starmer to go further and ban British arms sales to Israel completely.

Labour lost a number of former strongholds to independent candidates campaigning on pro-Palestinian platforms in the general election.

Already the government’s critics are saying the suspension has not gone far enough.

Liberal Democrat foreign affairs spokesperson Layla Moran said her party would “carefully scrutinise” the details of the announcement, “including those export licences which the government has not suspended”.

“We are concerned that the decision is made solely on risk of use in Gaza and not the West Bank,” she added.

Green MP Ellie Chowns asked why are so many licences were exempt from the suspension.

“I am very concerned that the government is not consistently applying the principle that there is a clear risk of UK licensed weapons being used in breach of international humanitarian law,” she said.

But Conservative MPs – including the shadow foreign secretary Andrew Mitchell – have criticised the decision.

Mr Mitchell said the move “has all the appearance of something designed to satisfy Labour’s backbenches, while at the same time not offending Israel, an ally in the Middle East”.

“I fear it will fail on both counts,” he added.

Conservative leadership hopeful Robert Jenrick branded the suspensions “shameful gesture politics” to appease MPs on the left-wing of the prime minister’s party.

The Campaign Against Arms Trade says that since 2008, the UK has granted arms export licences to Israel worth £574m ($727m) in total.

Research by Parliament shows the value of licences granted has declined from £42m in 2022 to £18.2m in 2023.