NEW YORK — Soon after the outbreak of the Iran war in late February, a string of attacks targeted Jewish sites in Europe. An explosion hit a synagogue in Belgium, arsonists ignited a synagogue in the Netherlands, a bomb rocked a Jewish school in Amsterdam, four Hatzola ambulances were torched in London and a car was burned in a Jewish neighborhood in Antwerp, all during March . A new group called Harakat Ashab al-Yamin al-Islamiya (HAYI) claimed credit. The group, whose name roughly translates to the Islamic Movement of the People of the Right Hand, was unknown until then. Analysts and investigators suspected Iranian involvement, but law enforcement investigations had not publicly exposed any connection to Iran. That changed this month, when US prosecutors in the federal Southern District of New York court connected Iran to the attacks in Europe and revealed plots targeting Jewish sites in the US. The investigation also shed light on the alleged motives and tactics of the attackers.…