But in a sign of the strain between New York's force and its mayor, thrown into sharp relief since Rafael Ramos and his partner were shot last week, numerous officers turned their backs outside as Bill de Blasio began to speak.
Vice President Joe Biden said the double murder was felt by the whole country.
"When an assassin's bullet targeted two officers, it targeted this city. And it touched the soul of the entire nation," Biden said.
Giant screens were installed outside the church for the crowd that overflowed for blocks. Amid the thousands of New York police, there were also officers from across the country, including from the states of Indiana, California and Georgia.
Tensions have flared in the United States since this summer over what protesters say is racism and excessive force against black Americans by the police.
Ramos, 40, was killed alongside his partner Wenjian Liu December 20 following nationwide demonstrations after grand juries failed to charge white officers in the killings of two unarmed black men over the summer.
Some police and others have pushed back against protesters and claimed officials have been too sympathetic, accusing them of inciting the attack.
They called for a change in tone from officials and for demonstrators to halt protests ahead of the funerals.
Mayor De Blasio, in particular, has been subject to withering criticism from some of the city's 35,000 police officers for his remarks following demonstrations.
A father of biracial children, De Blasio had told reporters he counseled his teenage son Dante to take extra care when dealing with officers.
But inside, de Blasio steered clear of the controversy in his remarks.
Ramos's "memory will live on in the hearts of his family, his congregation, his brothers and sisters of the NYPD, and literally millions of New Yorkers. We will not forget," de Blasio said.
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