British authorities are investigating a shadowy online group, Harakat Ashab al-Yamin al-Islamia, or HAYI, which has claimed responsibility for at least eight arson attacks on Jewish locations in London and several others across Europe in recent weeks. The latest incident occurred overnight at Kenton United Synagogue in Harrow, which sustained smoke damage but no injuries. The group's name roughly translates to the Islamic Movement of the Companions of the Righteous. It also claimed to have published a self-recorded video of the attack on a pro-Iranian militia group in Iraq. Six people, including two teenagers, have been arrested in connection with the arson attacks. Police are investigating whether the individuals in these incidents have been hired by the Iranian state actor or hired by an out-of-work criminal proxy.