2004 CherokeeU.S. safety officials have opened an investigation into 3 million Jeep Grand Cherokees from model years 1993 to 2004 because of reports that gas tanks could cause fires in some crashes, reports AP. The preliminary investigation, begun Aug. 23 by the National Highway Traffic Safety Traffic Administration, is the first step in determining whether a recall of the Chrysler-made SUV is needed. The advocacy group Center for Auto Safety in October asked NHTSA in October 2009 to review whether the gas tank's position below the rear bumper could cause fuel to spill if the SUV were struck from behind. Chrysler spokesman Michael Palese said the company is cooperating with the investigation and that the Grand Cherokee has an excellent safety record.