On Camera: Surveillance In Transit, Schools

A 1998 New York Civil Liberties Union survey identified 2,397 surveillance cameras at street level in Manhattan. In 2005, another NYCLU survey of Lower Manhattan, Greenwich Village, Chinatown and central Harlem found 4,468 cameras in those four districts alone.

Immigrants Felt Brunt of U.S. Reaction

The FBI generated a list of 7,600 people whose profiles shared similarities with the hijackers, and conducted some 3,200 interviews had taken place. Fewer than 20 people were arrested as a result of the interviews, none on terrorism charges.