2 nypd officers killed

PHOTOS: Saying goodbye to NYPD Det. Wenjian Liu
A wake and funeral are held for NYPD Detective Wenjian Liu, one of two NYPD officers ambushed and killed in December in Brooklyn.
Funeral held for NYPD Detective Wen Jian Liu
Officers salute police boss, mayor at NYPD Det. Wenjian Liu's wake
VIDEO: Mayor Bill de Blasio calls slain NYPD officer peacemaker
VIDEO: Gov. Cuomo pays tribute to slain NYPD Officer Rafael Ramos
Moment of silence observed for slain NYPD officers
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Funeral held for NYPD Detective Wen Jian Liu
Officers salute police boss, mayor at NYPD Det. Wenjian Liu's wake
VIDEO: Mayor Bill de Blasio calls slain NYPD officer peacemaker
VIDEO: Gov. Cuomo pays tribute to slain NYPD Officer Rafael Ramos
Moment of silence observed for slain NYPD officers