Four ambulances at a Jewish community rescue service in London were set ablaze on Monday morning in what local law enforcement authorities are investigating as an antisemitic hate crime. The incident occurred outside the Machzike Hadath synagogue located in the city’s largest Jewish community early Monday morning, the London Metropolitan Police Department reported.

Police officers responded to reports of a fire in the area at around 1:45 a.m. local time, according to the LMPD. Multiple explosions were heard and believed to be from gas canisters on the ambulances.