I covered this story for Flight International. The reason that the investigators (US? Canadian?) made so much of it was that the radio debate about what to do next involved, from memory, something like ten crews - all urging the crew not to report it. As posted, a USAF C-130 skipper was so shocked that he pulled the CB on his CVR to preserve the tapes.
This was pre-Internet and I can't easily find my own story without trawling our paper archives. If it was an NTSB report then it should be on their website which does cover that period.