going to come down or it would just fade and be a flair and then like big, big these would be thick streams of fire coming down. reporter: another witness was a man named mike wire who said he saw a flare-like object head up in the sky and strike the plane. i think it was a missile that went up. reporter: a twa pilot who on occasion flown the actual 747 who has been in the accident believed the missile theory. pilot terrell stacey is one of twa s representations in the investigation. the fbi and ntsb are political animals. they will do whatever it takes to cover their political rear ends. reporter: but there has never been any substanuation of evidence of an external explosion and 16 months after the most thorough and extensive aircraft investigation in u.s. history, the fbi announced no evidence had been found of a criminal act. the probable cause, an explosion of flammable fuel and vapors in the center fuel tank. as far as the eyewitnesss who
sanjay gupta. we need to be careful. we are just getting this information in. 51 years old. three months short of 52 years old. indications are a heart attack or stroke. what would your questions be? this is young to have a heart attack, even when you look at pre-existing health conditions. average age of someone having a first heart attack if this is what we are talking about is usually in the mid-60s. as you are suggesting, i think it is important there s limited information that we know. so the i think medical personnel. people trying to figure this out on the ground there are going to want to know are there any other potential risk factors here. if this was, in fact, heart disease, heart attacks typically cause something known as a cardiac arrest. the heart attack itself is caused because you are not getting enough blood to the heart. what can cause death is when the heart, as a result of that, starts to go in to abnormal rhythms. there are other things that can cause
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