A suspected arson attack has destroyed 32 vehicles, including coaches, trucks and tractors, parked at an outdoor carpark in Hong Kong's Lai Chi Kok in New Kowloon, the South China Morning Post reported.

No casualties were reported following the fire, which occurred just after midnight on Saturday. It took more than 100 firemen over two hours to bring the fire under control.

One resident said he heard five loud explosions over a 20-minute period, according to some local media reports.

Police said the cause of the fire was suspicious and that arson was suspected.