Reply #12: It was Reuters film and Reuters says it was filmed Sept 11 in

[Garbo 2004]

East Jerusalem:

Reuters rejects as utterly baseless an allegation being circulated by e-mail and the Internet claiming that it circulated 10-year-old videotape to illustrate Palestinians celebrating in the wake of the September 11 tragedies in the United States.

Reuters welcomes a statement by the Universidad Estatal de Campinas-Brasil (UNICAMP), one of whose students was the author of the original e-mail, setting the record straight.

The videotape in question was shot in East Jerusalem by a Reuters camera crew on September 11 in the immediate aftermath of the attacks on the United States. The footage was broadcast by CNN and other subscribers to the Reuters video news service.
http://archives.cnn.com/2001/US/09/20/reuters.statement/

Also Snopes: http://www.snopes.com/rumors/cnn.htm