Federal investigators are looking for the cause of a plane crash in Arkansas that killed all six members of a Cape Girardeau family. Dental records are being used to identify the bodies of Cape Girardeau doctor Mohammad Shakil, his wife, and their four children. The National Transportation Safety Board says the plane crashed in a remote part of the Ouachita National forest in misty and rainy flying conditions. Witnesses say the plane’s engine was sputtering when it went over their house just before the crash.