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John Minchillo, Associated Press
Investigators work at the scene where two NYPD officers were shot, Saturday, Dec. 20, 2014 in the Bedford-Stuyvesant neighborhood of the Brooklyn borough of New York. Police said an armed man walked up to two officers sitting inside the patrol car and opened fire before running into a nearby subway station and committing suicide. Both police officers were killed.

NEW YORK — New York City's police commissioner says the two officers who were ambushed and killed in their cruiser "were, quite simply, assassinated."

Police COmmisssioner William Bratton spoke Saturday at a news conference with Mayor Bill de Blasio. He identified the two officers killed in Brooklyn as Wenjin Liu and Raphael Ramos. He says they were shot without warning or provocation.

Bratton says the suspect shot his ex-girlfriend earlier Saturday in Baltimore.

De Blasio says the two officers are heroes.

The police officers were killed in the Bedford-Stuyvesant neighborhood. Authorities say the gunman ran inside a subway station and fatally shot himself in the head.