Most are believed headed to Brooklyn and the Bronx, which have seen three-quarters of the shootings reported so far this year.
Officer James Li is in stable condition at Kings County Hospital after police say he was shot in both legs by a man who tried to board a bus without paying.
William Bratton is being named to lead the NYPD as it tries to maintain a historic drop in crime and an extensive counterterrorism program, even as its tactics have come under increased scrutiny.
De Blasio is naming the first members of his administration this week.
Mayor-elect Bill de Blasio says changes in police policy will be the first big thing New Yorkers notice when he takes office.
Bratton insists he’s not campaigning for his old job and said he hasn’t spoken with the de Blasio transition team.
Police Commissioner Ray Kelly said Monday that the NYPD was engaging the help of officials in New Jersey and Long Island in the search for Avonte Oquendo.