Rashaun Nicholson, 31, had been shopping for gifts before he was gunned down Sunday, family said.
Police found illegal guns in Elvin Payamps' Glendale home, the NYPD said.
The victim, James A. Bryant, 20, had been in an argument with two men before the shooting, police said.
The NYPD is taking precautions, including relocating a firehouse, amid threats against police.
A Petland Discounts in Jamaica, Queens was robbed by a man with a sword, police said.
Jonathan Daza, 22, who was kicked by an officer during a fair, displayed "combativeness," the DA says.
Flushing and Whitestone residents filled the Church of St. Mel's for a service and candlelight vigil.
Protesters marched on Fifth Avenue on Dec. 23, 2014, calling for an end to police brutality.
The White House said the vice president would attend the NYPD officer's funeral in Queens on Saturday.
Rafael Ramos' cousin thanked Ismaaiyl's Brinsley's family Tuesday for their condolences.
One of the police unions circulated letters to keep the mayor and the speaker from officers' funerals.
NYC Pet.com put free trees for police outside all 9 of its locations after two officers were murdered.
Raquel Calleja died when Jennifer Montano crashed into her car in Prince's Bay, police said.
Stacey Staniland, 29, was arrested last week for burglary, police said.
The mother of the man who shot two NYPD officers offered her condolences to their families.
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