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165 surveillance cameras that will keep watch over thousands of residents around the clock.
When it is complete, the surveillance system will be bigger than those in large cities such as Philadelphia, San Francisco and Boston. And the fact that it will be monitored by ordinary citizens has raised privacy concerns.
Studies differ on effectiveness
A January study by the University of California, Berkeley, found that cameras did not reduce homicide in San Francisco but did help reduce the number of burglaries and some thefts. A New York University study found that cameras did not do much to deter crime in some public housing projects.