** FILE ** A surveillance camera is seen across the street from a Cabrini Green housing project building in Chicago in 2010. Thousands of surveillance cameras keep Chicago under closer watch than any other U.S. city. The John Hancock Center is in the background. (Associated Press)

** FILE ** A surveillance camera is seen across the street from a Cabrini Green housing project building in Chicago in 2010. Thousands of surveillance cameras keep Chicago under closer watch than any other U.S. city. The John Hancock Center is in the background. (Associated Press)