A website has published what it says are 573,000 intercepted pager messages sent during the 9/11 attacks in the United States. Wikileaks says it will not reveal who gave it the messages - some of which are from federal agencies as well as ordinary citizens.

Internet analysts say they believe the messages are genuine but federal authorities have refused to comment. The attacks on 11 September 2001 left nearly 3,000 people dead.

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