In New York City, security cameras have become ubiquitous in the years after the Sept. 11 terror attacks. But some of the biggest surveillance gaps are in neighborhoods where poverty and violent crime remain among the highest: public housing projects.

Only 41 percent of the city's public housing buildings have cameras installed.

One of those buildings is in Brooklyn's Boulevard Houses where a 6-year-old boy was stabbed to death on Sunday. A 7-year-old girl was wounded. And an 18-year-old woman was killed nearby a few days earlier. One resident of the Boulevard Houses says he and his neighbors feel "forgotten."

Mayor Bill de Blasio has vowed to hasten the installation of cameras throughout the city's public housing.

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Associated Press writers Jake Pearson and Verena Dobnik contributed to this report.