Several ambulances belonging to a Jewish volunteer rescue group were deliberately set on fire outside a synagogue in Golders Green, London, early Monday.

Police are treating the incident as an antisemitic hate crime and are searching for three masked suspects seen in security footage.

Explosions, likely caused by gas canisters inside the ambulances, woke residents as firefighters responded to the blaze.

Four of the organization’s six ambulances were destroyed, raising concerns of a targeted attack on the local Jewish community, CNN has reported.

No arrests have been made, and residents expressed fear and called for increased police presence in the area.