Zero Hour

Zero Hour is a Canadian/British documentary-style television series, which airs on The History Channel in the United States, History Television in Canada, and on the BBC in the United Kingdom. Zero Hour has also aired on Channel Seven in Australia (third series aired on Network Ten from May 1, 2010 and now plays on 7mate); on Discovery Channel in Africa, Asia, New Zealand, Brazil, and the Netherlands. The program focuses on retelling the details of tragic man-made disasters which each unfolded in less than an hour.

Certain episodes have been partially censored for particular broadcasts. One example is the Columbine High School massacre episode, which had some scenes cut (for intense violence, profanity, and racial slurs) when broadcast on Discovery Channel.

- wikipedia.org