A group of 2006 and 2007 Chevrolet Trailblazer sport utility vehicles is being investigated by U.S. safety regulators over reports of the driver-side door catching fire. A posting on the website of the National Highway Traffic Safety Administration states that the preliminary investigation covers over 309,000 vehicles that are built by General Motors. The NHTSA has received 12 consumer complaints, as well as field reports, which cite the melting or burning of the driver's power window master switch in those Trailblazer vehicles. Of the total number of complaints, 10 resulted to driver-side door fires, which took place while the SUV was being driven. A GM spokesman said that no injuries or accidents were reported. The Trailblazer probe comes after a separate investigation of 830,000 Toyota Motor Corp. RAV4 crossover vehicles and Camry sedans for electrical fires, which seem to have started from the power window master switch on the driver's door.