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An American group of hackers (黑客) which calls itself Poison Box had begun ruining Chinese websites after the April1 spy plane incident, top Chinese portal said.

The Chinese soon attacked back.

On April 2, Chinese hackers invaded two Government websites over the weekend, forcing the Department of labor and the Department of the Health and Human Services to shut down their sites for a short time.

The US Department of labor went off line for a few hours after a page in its website was changed to display a picture of Wang Wei, the Chinese pilot who died in the collision.

The page was titled China back! and read, in English, the whole country is so sorry for losing the best son of China ---Wang Wei forever. We will miss the end of the day.

On May1, hackers exchanged bad remarks in which the official White House website was defaced by a huge amount of e-mail garbage. On May5, the White House website fell victim to a denial of serviced attack that blocked access to the site for more than two hours.

The Computer Network and Information Security Management Office told web operators an average of 100 sites a day had seen some more form of attack.