Police and fire crews are investigating after a number of vehicles were deliberately set on fire in South Gloucestershire.
More than 20 vehicles are believed to have been set alight in the Bristol area on Sunday 3 April.
A Rolls Royce facility in Filton was also targeted.
Avon and Somerset Police received the first call at around 1.30am, reporting a vehicle fire in New Road, Stoke Gifford.
By 5.30am there were further reports of more vehicles set alight in locations across Bradley Stoke, Little Stoke and Stoke Gifford.
At about 3.45am other vehicles were on fire in a car park at Rolls Royce, which first opened in 2020.
One eyewitness said he was awoken to loud bangs and that the fire was controlled at around 5am on Sunday morning.
Residents may have heard some of the vehicles' fuel tanks exploding. Police have said there have been no reports of injuries or damage to buildings.
In a statement, the force said: "Officers are working closely with the fire and rescue service to respond to these incidents. Officers will be carrying out house-to-house enquiries and making a thorough investigation alongside Avon Fire and Rescue Service."
The extent of the damage is making it difficult to identify vehicles in order to notify the owners at this early stage of the investigation, it said.
Police would like to hear from anyone who finds their own vehicle has been damaged, as well as anyone with information or dashcam, CCTV or other footage which could assist their enquiries.
You can call 101 and give the log number 124 of Sunday 3 April. Alternatively, you can anonymously call the independent charity Crimestoppers on 0800 555 111.