Mayor Bill de Blasio said Monday that New York is the country's "chief terror target" and vigilance is needed every day.
The mayor kicked off his re-election campaign with the city split on his job performance.
Randolph Holder, 33, was a five-year veteran of the NYPD and third-generation officer.
He was the fourth NYPD officer to be killed in the line of duty in the past year.
The former tennis star was tackled by a New York City police officer outside of a hotel on Wednesday.
Homeless-related 311 complaints have soared some 60 percent since de Blasio took office.
Atlanta police chief George Turner explains how to make a police force reflect the community its serves.
Moore is the fifth officer shot in five months.
Marcos Alonso Zea, 26, is an American citizen.
Some officers were also found to have quickly resorted to using the hold when they met verbal resistance, according to a report released Monday.
Look for other reasons than words for the fatal act of a madman.
The mayor's good news on crime comes amid strained relations with police.
The group who organized the banner is over 200 strong.
His mother believes Ismaaiyl Brinsley suffered from mental illness, he had tried to kill himself by hanging a year ago.
Police officer union President Pat Lynch said the "blood on the hands starts on the steps of City Hall in the office of the mayor."
The price of broken windows policing.
Protests in New York over the police chokehold case will stretch into days ahead with the aid of social media and established networks, activists said on Friday.