British Jews face the greatest threat in their history, as police investigate an Iran-linked group claiming responsibility for a spree of antisemitic attacks, London’s top cop warned. “If you overlay three things now — hate crime, terrorism and hostile state activity — you add all that together, that combined effect with that building of ideology online, that is really dangerous and troubling,” Sir Mark Rowley, head of London’s Metropolitan Police, told The Times of London Friday. “Whether you’re extreme left, whether you’re an Islamist terrorist, whether you’re a right-wing terrorist, and some hostile states as well, now with some sort of Iranian-related threats. There’s sort of a ghastly Venn diagram that they’re at the middle of,” Rowley added. Commissioner of the Metropolitan Police Sir Mark Rowley at the scene of an antisemitic double-stabbing on Wednesday that Iran-linked group Harakat Ashab al-Yamin al-Islamia took credit for.…