B riefing his officers in a van in north London, Inspector Thomas Vie warned there was a “real possibility” that a terrorist could target Jewish events in the capital that night. More than five times the usual number of police officers were on duty on Tuesday to protect thousands of orthodox Jewish families who were celebrating the religious festival of Lag B’Omer, which fell less than a week after two Jewish men were stabbed in a terror attack in Golders Green . Hours earlier, a former synagogue in Tower Hamlets, east London, was targeted in an arson attack – the latest in a terrifying string of incidents aimed at Jewish Londoners. Lag B’Omer is marked with parades, bonfires and dancing in Jewish areas across the capital. At one event held at a school in Stamford Hill, which is home to one of Europe’s largest Hasidic communities, the terrorist threat assessment had been increased to “substantial”.…