An FBI informant's covert recording of a meeting near the World Trade Centre on September 11th has been released.
It is believed to be the only known uninterrupted audio recording of the attack on New York.
Mr Steven McArdle, a tax consultant, was at a nearby hotel to meet the assessor as part of an investigation. Their discussion was being recorded by two FBI agents a few blocks from the twin towers.
On the tape, obtained by the New York Daily News, the conversation about bribery was stopped by the muffled boom of the first hijacked plane hitting the north tower.
"That was an explosion," Mr McArdle said on the tape, according to the newspaper. "Let's get out of here!"
The tape captured panicked voices and screams, the sounds of sirens and the rumble as the second plane approached and then crashed into the south tower.
AP