An earlier version of the script did n't feature the investigation side-plot set around Detective Sandra Cassidy . Although the film is entirely set in New York , shooting took place in winter 2000 in both New York and Toronto . Due to the film 's release just two weeks after the September 11 attacks , the filmmakers contemplated delaying the movie , but ultimately decided against it . However they moved to quickly cut out and replace shots of the World Trade Center from the edit , such as the opening shot , which now instead shows Brooklyn
September 11 attacks
September 11 attacks
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