Firefighters tackled a blaze which spread from a block of terraced houses in Huddersfield.
Fire crews were called to Lower Fitzwilliam Street, near the Great Northern Retail Park, off Leeds Road, around 10.30am this morning.
Firefighters arrived to find mattresses and rubbish ablaze at the back the houses.
The flames had spread to the rear of the houses and through metal fencing into a compound where used cars were stored.
Two neighbouring houses were damaged, one of them extensively.
Three cars in the compound, belonging to the Pentagon Huddersfield Nissan dealership, were also badly damaged.
Fire crews from Dewsbury put out the fire and the cause is under investigation. No-one was hurt.
Three cars, a Mitsubishi Warrior, an Alfa Romeo and a Nissan Note, were damaged.
Crew commander Stephen Carruthers, of Dewsbury Fire Station, said: “We are still looking into what caused the fire. Rubbish including some mattresses was on fire when we arrived.
“Smoke alarms went off and we will be visiting properties in the area telling people about fire prevention.
“The police have been informed but we don’t know yet whether it was deliberate or accidental.”
Barry Sykes, the 79-year-old owner of the houses, said: “We have owned them for over 40 years.
“It just so happened by chance that my wife and I were driving down this road on our way to the nearby retail park when the fire had just got going, about 10.30am.
“It may be that someone has flicked a cigarette and it has started from there.”
Bev Walker, who lives in a neighbouring house, said: “My husband Brett was in bed and I saw it happening. There was lots of smoke, it’s looking a mess.”