This undated photo provided by Chrysler shows a 1998 Jeep Grand Cherokee. The National Highway Traffic Safety Administration says on its website that it has added Jeep Liberty and Cherokee SUVs to the investigation. The probe now covers 5.1 million vehicles.  The agency says 15 people have died in 26 Grand Cherokee fires. The investigation affects 1993 to 2004 Grand Cherokees. Also covered are 1993-2001 Cherokees and 2002-2007 Liberty's.  (AP Photo/Chrysler)
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