WASHINGTON — The government is investigating reports of engine fires in General Motors' full-size sport utility vehicles.

The National Highway Traffic Safety Administration says it has received two reports of fires on 2007 model year Chevrolet Tahoe SUVs.

Both reports allege that the vehicles were parked in a home garage with the engine shut off when the fires occurred, causing significant property damage.

The investigation, which also includes the 2007 GMC Yukon SUV, involves about 423,000 SUVs.

General Motors Corp. spokesman Alan Adler said Monday the company was cooperating with the government. He said GM has not been able to identify any trend with the vehicles.

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