<div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>UK Prime Minister Kier Starmer has been heckled by about 100 protesters holding signs saying "Keir Starmer, Jew harmer" as he visited the site where two Jewish men were stabbed in a terrorist attack.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>The prime minister said in response that "I absolutely understand the high levels of anxiety and concern that there are."</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"Antisemitism is an old, old hatred. History shows that the roots are deep, and if you turn away, it grows back," he said during a televised statement at 10 Downing St.</span></div></div><div><div id="adspot-mobile-medium"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>LIVE UPDATES: </span></strong><a href="https://www.9news.com.au/world/us-politics-live-iran-israel-middle-east-war-may-1-donald-trump-king-charles-visit/967c1525-a092-46f8-8202-12d36983ed1d"><strong><span>Trump scraps tariffs for King Charles</span></strong></a><strong></strong></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"Yet far too many people in this country diminish it."</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>The heckling comes as the UK's official terror threat level was raised from substantial to severe after Wednesday's stabbing attack in London, which police have called an act of terrorism with potential links to Iran.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Severe is the second-highest rung on a five-point scale and means intelligence agencies consider an attack highly likely in the next six months.</span></div></div><div><div class="OUTBRAIN" data-reactroot="" data-src="//www.9news.com.au/world/uk-raises-terror-threat-level-as-keir-starmer-heckled/b42f7842-84aa-4f1b-90ce-5647a839e149" data-widget-id="AR_5"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE:</span></strong><span> </span><a href="https://www.9news.com.au/national/body-found-in-search-for-missing-northern-territory-girl/d2aa7d07-20a3-4e85-965b-dcae5f71dd4d" rel="" target="_blank" title="Riot breaks out as crowd demands handover of man accused of murdering girl in Alice Springs"><strong><span>Riot breaks out as crowd demands handover of man accused of murdering girl in Alice Springs</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>The change comes as a 45-year-old man, who is also accused of trying to stab police officers, was arrested on suspicion of attempted murder, the Metropolitan Police said in a statement.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Two men – one in his 70s and one in his 30s – were injured in the attack in Golders Green and are in a stable condition in hospital, police added. No officers were injured.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Police have declared the attack an act of terrorism as officers study a claim by a group known as Harakat Ashab al-Yamin al-Islamia (HAYI), whose name means the Islamic Movement of the Companions of the Right, that it was behind the attacks.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Israel's government has described the group, as a recently founded group with suspected links to "an Iranian proxy" that has also claimed responsibility for synagogue attacks in Belgium and the Netherlands.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE:</span></strong><span> </span><a href="https://www.9news.com.au/world/donald-trump-gold-statue-cryptocurrency-doral-florida-golf-course-usa-politics-news/86757205-191c-4eab-b021-8cd9038da89f"><strong><span>Giant golden statue of Trump installed at his Florida golf course</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>An online claim in the same name also took responsibility for Wednesday's stabbing. But security experts say the name may be a flag of convenience rather than a coherent group, and its claims should be treated with caution.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>However, the UK has accused Iran of using criminal proxies to conduct attacks on European soil targeting Iranian opposition media outlets and the Jewish community.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Britain's MI5 domestic intelligence service says that more than 20 "potentially lethal" Iran-backed plots were disrupted in the year ending in October.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"This has now formally been declared a terrorist incident," London's head of counterterrorism policing, Laurence Taylor, said in a statement. Police are investigating "whether this attack was deliberately targeting the Jewish community in London," he added.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Counterterrorism officers are leading the investigation and working to establish the suspect's nationality, background and any terrorist links, police said.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><em><strong><span>NEVER MISS A STORY:</span></strong></em><span> </span><em><span>Get your breaking news and exclusive stories first by following us across all platforms.</span></em></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><ul><li><em><strong><span>Download the 9NEWS App here via</span></strong></em><span> </span><a href="https://apps.apple.com/au/app/9news/id1010533727" target="" title=""><em><strong><span>Apple</span></strong></em></a><span> </span><em><strong><span>and</span></strong></em><span> </span><a href="https://play.google.com/store/apps/details?id=nineNewsAlerts.nine.com&amp;hl=en_AU&amp;pli=1" target="" title=""><em><strong><span>Google Play</span></strong></em></a></li><li><em><strong><span>Make 9News your preferred source on Google by</span></strong></em><span> </span><a href="https://9.nine.com.au/8x987w" target="" title=""><em><strong><span>ticking this box here</span></strong></em></a></li><li><em><strong><span>Sign up to</span></strong></em><span> </span><a href="https://login.nine.com.au/edm?client_id=nineatnine" target="" title=""><em><strong><span>our breaking newsletter here</span></strong></em></a></li></ul></div></div>