"There is no information to corroborate this aspirational threat," Knocke said, adding that the alert was issued "as a routine matter and out of an abundance of caution. There is no immediate threat to our homeland at this time."

The Web site calls for attacks against American economic sites in retaliation for Muslims being held at the U.S. prison at Guantanamo Bay, Cuba, which houses prisoners accused of ties to terrorism groups, said another government official.

The site called for attackers to use viruses that can penetrate Internet sites and destroy data stored there.

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