LONDON (AP) — In a High Court hearing starting Tuesday, the U.K. government will defend its decision to continue supplying parts for F-35 fighter jets that may be used by Israel in Gaza,

The legal challenge was brought by human rights groups, which argue that the government is breaking domestic and international law and is complicit in atrocities against Palestinians by allowing essential components for the warplanes to be supplied to Israel.

The government said in September that it was suspending about 30 of 350 existing export licenses for equipment deemed to be for use in the conflict in Gaza because of a “clear risk” that the items could be used to “commit or facilitate a serious violation of international humanitarian law.” Those equipment included parts for helicopters and drones.

But an exemption was made for some licenses related to components of F-35 fighter jets, which have been linked to Israel’s bombardment campaign in the Gaza Strip.

Rights groups argue that the United Kingdom shouldn't continue the export of the parts through what they call a “deliberate loophole” given the government's own assessment of Israel’s compliance with international humanitarian law.

Palestinian human rights organization Al-Haq and the U.K.-based Global Legal Action Network, which brought the legal challenge, say the components are indirectly supplied to Israel through the global spare parts supply chain.

U.K. officials have argued that stopping the export of F-35 fighter jet components would negatively impact international peace and security.

Compared to major arms suppliers such as the U.S. and Germany, British firms sell a relatively small amount of weapons and components to Israel.

The Campaign Against Arms Trade nonprofit group estimates that the U.K. supplies about 15% of the components in the F-35 stealth combat aircraft, including its laser targeting system.

“British-made F-35s are dropping multi-ton bombs on the people of Gaza, which the U.N. secretary-general has described as a ‘killing field,’” said Charlotte Andrews-Briscoe, a lawyer for the Global Legal Action Network.

“The U.K. government has expressly departed from its own domestic law in order to keep arming Israel. This decision is of continuing and catastrophic effect," she added.

The hearing is expected to last four days and a decision is expected at a later date.

Israel resumed its bombardment in Gaza in March, shattering a two-month ceasefire with Hamas. More than 52,800 people, more than half of them women and children, have been killed in Gaza, according to the territory's health ministry. The ministry’s count doesn't differentiate between civilians and combatants. Israel says it has killed thousands of militants, without giving evidence.

The war began on Oct. 7, 2023, when Hamas militants attacked southern Israel, killing 1,200 people and taking 251 hostages.

In November, the International Criminal Court issued arrest warrants for Israeli Prime Minister Benjamin Netanyahu and Hamas’ military chief, accusing them of crimes against humanity in connection with the war in Gaza.