Blogger Nguyen Hue Chi is locked in an electronic game of cat and mouse with a mystery cyberattacker—widely believed to be the government.Chi and his colleagues have set up a series of websites and blogs questioning government policy in the past year, only to see them attacked and blocked.Observers blame the communist state, which they say has adopted a more aggressive stance towards politically sensitive Internet sites. "It seems that the government is definitely starting to follow the China model," said a foreign diplomat who asked for anonymity.

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