Liverpool: A blaze has destroyed every vehicle left in a 1,600-capacity car park serving the British city of Liverpool's indoor arena, police said Monday.

The Liverpool International Horse Show, taking place in the northwest English city's neighbouring 11,000-seater arena, was cancelled due to the fire, which broke out after dark on Sunday.

Nobody has been seriously injured in the blaze, the local Merseyside Police said, while all horses are accounted for.

"Initial investigations indicate that an accidental fire within a vehicle caused other cars to ignite," the force said.

"We believe that all vehicles parked in the car park have been destroyed and advise owners to contact their insurance companies."

Liverpool Mayor Joe Anderson said the blaze started in a four-wheel drive vehicle on the third level.

-APP