A New York Police Department officer wore a black band across his badge on Sunday for the funeral of Officer Wenjian Liu. Credit Sam Hodgson for The New York Times

After Ambush, a Second Police Funeral

By J. DAVID GOODMAN

As thousands of police officers gathered in Brooklyn to lay to rest Officer Wenjian Liu, who was killed last month, scores of officers turned their backs on Mayor Bill de Blasio.

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