People light candles during a vigil on Sunday, December 21, for two NYPD officers who were ambushed and killed on Saturday. The two NYPD officers, Wenjian Liu and Rafael Ramos, were shot while sitting in their police car. Police have named Ismaaiyl Brinsley as the shooter. Seth Wenig/AP
Lucy Ramos, aunt of slain police officer Rafael Ramos, speaks at a news conference in front of Ramos' childhood home on December 21. Michael Graae/Getty Images
A New York City police officer kneels on Sunday, December 21, in front of a small memorial for two police officers who were killed in Brooklyn, New York, on Saturday. JUSTIN LANE/EPA
The Rev. Al Sharpton, center, speaks about the killings of the officers during a news conference at the National Action Network headquarters in New York on December 21. Behind him are, from left, Esaw Garner, widow of Eric Garner; attorney Michael Hardy; Gwen Carr, mother of Eric Garner; and attorney Jonathan Moore. Mark Lennihan/AP
Brooklyn Borough President Eric Adams, third from right, speaks on December 21 while Manhattan Borough President Gale Brewer, fourth from right, and Bronx Borough President Ruben Diaz, right, listen during a news conference at an impromptu memorial near the site where the officers were shot. Seth Wenig/AP
Mourners stand at attention as the bodies of two fallen NYPD officers are transported from Woodhull Medical Center on Saturday, December 20. John Minchillo/AP
New York Police Department Commissioner Bill Bratton speaks alongside Mayor Bill de Blasio, left, and NYPD's Chief of Department James O'Neill, right, during a news conference at Woodhull Medical Center on December 20. John Minchillo/AP
Investigators work the scene where two NYPD officers were shot December 20, in the Bedford-Stuyvesant neighborhood of Brooklyn, New York. John Minchillo/AP
The officers were shot and killed ambush-style Saturday afternoon as they sat in their patrol car in Brooklyn, officials said. John Minchillo/AP
The officers -- one with two years' experience, the other with seven years on the job -- were normally assigned to downtown Brooklyn but were working a "critical response" detail in an area with higher crime, police said. John Minchillo/AP
The shooter was found dead in a nearby subway station from a self-inflicted gunshot wound, officials said. The shooter, identified as Ismaaiyl Brinsley, arrived in New York from Baltimore, police said. /John Minchillo/AP
The shooting occurred near Myrtle and Tompkins avenues in the Bedford-Stuyvesant section of Brooklyn. Spencer Platt/Getty Images
Police officers gather near the scene of the shooting. U.S. Attorney General Eric Holder called the attack "an unspeakable act of barbarism." Spencer Platt/Getty Images
An officer with a police dog monitors the scene on the evening of December 20. Spencer Platt/Getty Images