Concerning the investigation of the Paris crash, they make a big deal out of witness testimony that the aircraft was on fire about 700 yards before the aircraft ran over the metal strip. There are two issues with this argument: #1 eye witness testimony tends to be highly unreliable and #2 the location where the metal strip was found, does NOT tell you where the aircraft might've encountered it. It could very well have been picked up at one point on the runway, lodged either in the landing gear assembly or elsewhere on the aircraft and shaken loose further down the runway.