A group of British lawyers has applied for a court summons to privately prosecute a dual British-Israeli national over their involvement in Israel's military.
The International Centre for Justice for Palestinians (ICJP) said in a statement on Thursday that the filing, made on Monday, relates to an individual who served in the Israeli army's border unit, as well as in the occupied West Bank.
The British-Israeli national appears to have voluntarily signed up for army service.
The ICJP said that the unnamed soldier "is alleged to have committed the offence of enlisting in the service of a foreign state contrary to Section 4 of the Foreign Enlistment Act 1870".
The UK government's official website for legislation describes the law as "An Act to regulate the conduct of Her Majesty’s Subjects during the Existence of Hostilities between Foreign States with which Her Majesty is at peace".
The ICJP highlighted that Palestine is a signatory to the Rome Statute and is not in conflict with the UK.
"Palestine is a friendly state to the United Kingdom, as the UK government recognises its statehood, and the two countries are not at war."
An initial hearing for the ex parte application - a request carried out without notifying the other party - will take place in the coming weeks, according to the ICJP.
“In line with ICJP’s Global 195 campaign, this is a significant step in holding suspected war criminals accountable within domestic jurisdictions for offences that they have committed outside of their home countries," said the ICJP's Head of Legal, Mutahir Ahmed.
"War criminals must be held accountable for their role in the genocide, from the most senior generals to the most junior foot soldier.”
If prosecuted and found guilty, the accused could face up to two years' imprisonment.
In its statement, the ICJP indicated that it is looking into several other cases of both UK nationals and dual British-Israeli citizens who have travelled to serve with the Israeli army, in potential breach of the Foreign Enlistment Act.
Israel's devastating war on Gaza, which has killed at least 68,000 people and displaced more than a million Palestinians, has increased global scrutiny on Israel and its army. UN experts and rights groups have deemed the war to be a genocide, with Israel facing genocide charges at the World Court over its actions in Gaza.
Legal action has also been taken against individual Israeli soldiers, including in Europe, Asia and South America.
In January, an Israeli soldier fled Brazil after the country's Federal Court ordered police to open a war crimes investigation against him.
In August, the ICJP filed a request with Dutch police for the arrest of two Israeli soldiers suspected of war crimes in Gaza.
Several other filings have also taken place around the world, with legal groups attempting to bring Israeli soldiers to justice over crimes committed in the occupied Palestinian territories.