NEW YORK—Thousands of police turned their backs Sunday as Mayor Bill de Blasio eulogized an officer shot dead with his partner, repeating a stinging display of scorn for the mayor despite entreaties to put anger aside.

As thousands of mourners prepare to attend the wake and funeral of a second New York City police officer killed in an ambush shooting, police Commissioner William Bratton is urging the rank-and-file to refrain from making political statements.

Hundreds of officers standing outside the church where a funeral is being held for a New York City policeman killed in an ambush shooting have turned their backs on the mayor as he spoke during the service.

Thousands of officers from across the country filled the streets Saturday outside the church where a funeral will be held for a policeman shot to death with his partner in an ambush that shook the city and put an end to large-scale local protests criticizing police over a series of high-profile, in-custody deaths.

Thousands of people were expected to attend the funeral of a New York City police officer shot to death along with his partner one week ago in a brazen daylight ambush that shook the city and put an end to large-scale local protests criticizing police following a series of high-profile deaths in police custody.