GM Looking for Car Spies

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Detectives for General Motors are trying to find out how photos of the automaker's upcoming line of large sport utility vehicles made it onto the Internet.

There's nothing new about spy photography of unreleased vehicles. But the three photos that hit the Internet last week show the new Chevrolet Tahoe and Cadillac Escalade in what looked like a photo studio or warehouse.

A GM spokesman says the automaker suspects an insider was behind the leak.

The photos of GM's new SUVs now circulating on the Internet involve highly profitable vehicles crucial to GM's future.