A house, caravan, two vans and three cars “were deliberately set on fire” on a road in Bristol, police have said.
The blazes broke out in Lake Road, Westbury-on-Trym, at around 03:00 BST on Saturday.
Avon Fire and Rescue Service said the fires were brought under control quickly and a fire investigation officer is working to find the cause.
Jim Hackford, whose car was damaged, said it had been “scary” waking to the sound of “tyres popping” and “bangs”.
Avon and Somerset Police is appealing for anyone with information, CCTV or dashcam footage to come forward.
“Several cars and an unoccupied caravan were set alight, with the flames spreading to cause extensive damage to the front of a nearby house,” a spokesman for the force said.
“Thankfully no-one was hurt, but given the time of night this act endangered the lives of the householders.”
Mr Hackford said he was woken at about 03:00 BST to “loud bangs” and a “strange bright orange glow”.
“I got out of bed and saw my neighbour’s caravan was engulfed in flames and the tyres were popping,” he said.
“A bunch of cars and vehicles were also on fire, up and down the road, and a couple of houses.
“I couldn’t believe my eyes. I freaked out, it was scary, I kept thinking what else is going to happen.”
Patricia Simpson, who lives nearby, said: “I heard a few bangs and thought it sounded like gunshots but it was the car making the noise because it was on fire.
“The flames were huge. It’s a shocking thing to see. You see it in the movies but you don’t see it in real life.”