Chinese authorities have blocked access to the video-sharing Web site YouTube -- the latest victim of a politically motivated Internet crackdown.

Authorities in Beijing have not explained why the site has been targeted for censorship.

There is widespread speculation, however, that YouTube has been targeted because of a video showing Chinese police taking violent measures against Tibetan protesters.

The footage was compiled from protests that occurred in March 2008, as well as during anti-Chinese riots that took place in the Tibetan capital of Lhasa in 1988.

It was uploaded to YouTube by Tibetans living in exile overseas.

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