The mayor said he was unaware of problems at the Mission Society's Harlem SNUG site.
The ShotSpotter program will roll out to five different areas in Brooklyn and The Bronx.
The 103rd Precinct recorded one shooting since Oct. 24 last year, the commanding officer said.
The 79th Precinct's streak is attributed to community partnership and an "omnipresence" of officers.
Jovan Frederick, 32, faces attempted murder, assault and robbery charges, police said.
Police from the 84th Precinct took two weeks off patrol after Dets. Liu and Ramos were shot to death.
The victim in the Dec. 18 shooting was not the intended target, police said.
A recent fight between two gang-affiliated groups fueled an uptick in shootings, officials said.
Jaquay Bennett was killed and a 17-year-old gang member was injured last week in Crown Heights.
Mayor de Blasio and Bratton announced a 4.6 percent drop in serious crime in 2014.
Shmurda shot near a crowd outside an East Flatbush barbershop over the summer, prosecutors said.
The number of people shot and killed by police officers decreased 50 percent.
Citywide crime has dropped by 4.4 percent, Mayor Bill de Blasio announced.
There have been 13 shootings in the 103rd Precinct this year and officals say gun seizures have helped.
Lee added memorials to Eric Garner, Mike Brown, John Crawford and Ezell Ford outside his studio.
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