NEW YORK (AP) — 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.