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A spokesperson for YouTube, which is owned by Internet search company Google, said the firm "does not allow videos showing dangerous or illegal acts."
However, videos on the site include the footage of a man being shot in the head in a murder attributed to The Zetas. It has been viewed more than 280,000 times.
The YouTube spokesperson said it was up to users to flag footage as inappropriate, and that all content so marked was then reviewed by the company and could be removed.