CCTV footage has captured people approaching ambulances shortly before several vehicles serving a Jewish community were set alight in north London.
The Metropolitan Police say the incident, which damaged four Hatzola ambulances, is being investigated as an antisemitic hate crime.
Fire crews were called to Highfield Road in Golders Green at about 01:40 GMT after reports of the blaze.
The London Fire Brigade found multiple ambulances on fire when they arrived.
Video from the scene shows suspects near one ambulance moments before it ignites, and another clip records a large inferno and an explosion as the fire takes hold.
No injuries have been reported and firefighters have since extinguished all the blazes.
Police inquiries are ongoing as officers follow up on the evidence captured on camera.
