atomant, here's a link to the story from 1967 re the "Shag Harbour Incident" (Nova Scotia), which involved many witnesses, the RCMP, and NORAD. There's a video on youtube, which I'll also link.
These things don't get discussed much here. It's considered wacko by the science police, along with anything that remotely smells of 'conspiracy' theory ... just a heads-up. This local story is rather interesting, and has never been explained by the government.
http://www.ufoevidence.org/Cases/CaseSubarticle.asp?ID=170
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This video, is from the Discovery Channel, I don't know which show, and it tells the tale of the Shag Harbour Incident. Enjoy. :)