Lol! Yes, we don't use the term Native Canadians all though some people say "native" however we have had gang problems here, there is a gang called the native syndicate and the indian posse so both words can be taken as... I wouldn't say derogatory, but might have a negative connotation. Where I live we have a very large native population that makes up most of our prison population and has a lot of trouble with poverty. I guess in the States you could compare it to the struggle that many African Americans have.
We took "First Nations Studies" in school so that's just what I call them, our university is First Nations University and we have a First Nations Exhibit at the museum. So, technicaly it's the same as native to the land... the first ones in our nation. I think it just, I don't know, sounds more respectful but it's a cultural thing. A lot of racist people here call them indians or "natives" in a nasty way. When I used the term with my "First Nation" friend I think she found it amusing. She once used the word "indian" then corrected herself quickly and said, "ah-I mean First Nations".
No word on the missing teen, rumours abound but that's all there is. There has been a $50,000 reward offered for any information.