The incident comes in the wake of a spate of arson attacks on synagogues and Jewish community sites in north London in recent weeks.
A little-known group believed to be linked to Iran claimed one of its "lone wolves" stabbed two Jewish men in north London on Wednesday, the SITE Intelligence Group reported.
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The men "were targeted by our lone wolves in the Golders Green area of London," Harakat Ashab al-Yamin al-Islamiya (HAYI), meaning The Islamic Movement of the People of the Right Hand, said in a claim posted online.
HAYI has claimed responsibility for a spate of attacks on Jewish-linked targets across Europe in the last two months, including several in the British capital prior to Wednesday's stabbing, which police have declared a "terrorist incident."
The men were stabbed in what police are calling a terrorist incident in Golders Green, an area of north London that is home to a large Jewish community.
A man was arrested after he was seen running with a knife "attempting to stab Jewish members of the public," the Shomrim Jewish neighbourhood watch said on social media.
It added that two people were stabbed and were being treated by Hatzola, a Jewish volunteer ambulance service.
"There has been a knife attack today in Golders Green. The suspect has been arrested," the Community Security Trust added on X.
"We are working closely with the police and urge anyone with information to contact the police, Shomrim and CST immediately," said the charity, which provides safety advice and security to Jewish groups and buildings such as synagogues.
UK Prime Minister Keir Starmer has said the attack was "deeply concerning".
Starmer told lawmakers in UK parliament that a police investigation was under way and "we all need to ... be absolutely clear in our determination to deal with any of these offences, the like of which we have seen too much recently."
"London's Jewish community have been the target of a series of shocking antisemitic attacks. There must be absolutely no place for antisemitism in society."
The incident comes in the wake of a spate of arson attacks on synagogues and community sites in north London in recent weeks.
The first attack in late March saw four ambulances belonging to the Hatzola charity set ablaze.
Other incidents have followed, including an attack on the Kenton United Synagogue in Harrow as well as the premises of a Jewish charity. Last week, the Finchley Reform Synagogue was targeted.
Police have arrested 26 people for the various attacks launched since the start of the US-Iran war on Iran on 28 February.
Israel's foreign ministry urged the UK government to take swift action against antisemitism after the stabbings.
"After attacks on synagogues, Jewish institutions, community ambulances and now Jews targeted in Golders Green, the UK government can no longer claim this is under control," the ministry wrote on X.
"Starmer's statements are no substitute for confronting the roots of antisemitism festering across United Kingdom."
"Enough words. The UK must act decisively and urgently," the foreign ministry said.