EDIT: The Guardian has a pretty good live blog feed giving constant updates - http://www.theguardian.com/world/2014/mar/08/malaysian-airli...

Very sad. Only the third crash of a 777 since being introduced in the 90s.

[1]Confirmed 14 nationalities amongst the passengers, including:

    China - 153 (including 1 infant)
    Malaysia - 38
    Indonesia - 12
    Australia -7
    USA - 4 (including 1 infant)
    France - 3
    Canada - 2
    New Zealand - 2
    Ukraine - 2
    Russian - 1
    Italy - 1
    Taiwan -1
    Austria - 1
    Netherlands - 1

[1]: http://www.malaysiaairlines.com/my/en/site/dark-site.html