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We are back now with that ABC news investigation into a growing and potentially dangerous mystery surrounding one of the most respected luxury carmakers in the world. Dozens of BMW owners say their vehicles suddenly burst into flames while they were parked. Even turned off. Our chief investigative correspondent Brian Ross is here and, Brian, you have our attention. What did you find? Good morning, robin. This is a story about a mystery with a dozen BMW owners and fire departments around the country trying to figure out how one of the most expensive cars on the road could catch fires hours, days after they had been parked and turned off.

The owner of this BMW said he still can't believe what happened to his car after he parked it. I had parked it for maybe, say, five minutes and it was completely turned off. Reporter: But then over the next nine minutes and 15 seconds as this home video shows a white wisp of smoke coming out of the front hood. It's on fire.

I'm so scared. Reporter: Would be followed by heavy smoke and flames envelope the car as firefighters arrive.

Reporter: They struggle to put it out. In the end a total loss and a very big question for BMW from the owner taz. What if I was in the car while this happened, right? Let alone if it was parked in the garage at our house. My car is on fire.

Reporter: It is a question being asked by dozens of BMW owners around the country. I hadn't driven it all day and parked it at 10:00 at night. What kind of car is it. Reporter: Fire departments too. Reporter: All involving BMWs described as safely parked and turned off. That's not supposed to happen. No, when a car is off and it catches fire you've obviously got a problem.

Reporter: But BMW says there is no problem, no defect. With its reputation for excellence on the line and almost 5 million BMWs on the road -- The ultimate driving machine. Reporter: -- The company says fires are rare but an investigation by ABC news -- Fire was coming out from under here going up the side of the car.

Reporter: And our ABC own stations across the country. Had parked the car and woke up to a car on fire. Reporter: Discovered dozens of such mysterious fires over the last five years. The car is on fire it's right next to the house. Mc Menor Do Chapa Malandragem E Ser Malandro Baixar Gratis.

Reporter: Including this case in gloss ter, Massachusetts, earlier this year where a fire and a brand-new BMW quickly spread to the house. The fire department says the car had been parked and not moved for a full five hours. Does that surprise you? Very surprising. It was the first one I had heard of in 32 years on the job. Reporter: Outside Washington, D.C., the people who live here were lucky to get out after their parked 2008 BMW SUV caught on fire in the garage. There was black smoke and snap, crackle pop coming out an a flame.

You cannot do a thing except watch. Reporter: And it's not just North America.

We found reports and internet videos of parked BMWs catching on fire around the world. Reporter: China. Reporter: India and Korea where the government is now investigating.

BMW refused to provide anyone to appear in our report. In a statement the company told us that based on its investigation, we have not seen any pattern related to quality or component failure and it said the fires could be caused by poor maintenance but the bottom line is the fires remain what we might call a burning mystery. A burning mystery, indeed. Michael, there's a shark This transcript has been automatically generated and may not be 100% accurate.