UK police said on Sunday they are investigating whether a string of arson attacks on Jewish sites in London are the work of Iranian proxies, as the country’s chief rabbi said British Jews are facing a campaign of violence and intimidation.The Metropolitan Police force says counterterror officers are investigating fires at synagogues and other sites linked to the Jewish community, as well as an attack on a Persian-language media company.No one has been injured in the blazes, the latest of which...