Latest on NYPD funeral: Mourners pack Long Island church for 25-year-old officer's Mass

A member of the police honor guard has his badge covered in mourning as he arrives for the funeral mass for New York City police officer Brian Moore, Friday, May 8, 2015, at the St. James Roman Catholic church in Seaford, N.Y. As many as 30,000 police officers from across the United States are expected to pay their respects at the Long Island funeral for the young police officer slain on patrol. (AP Photo/Mary Altaffer) (The Associated Press)

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A heavily armed police officer stands guard near the funeral Mass for New York Police Department Officer Brian Moore, Friday, May 8, 2015, at the St. James Roman Catholic Church in Seaford, N.Y. The 25-year-old died Monday, two days after he was shot in Queens, while on patrol. (AP Photo/Mary Altaffer) (The Associated Press)

Police snipers survey the area from the roof of an elementary school before the funeral mass of New York City police officer Brian Moore at Friday, May 8, 2015, at the St. James Roman Catholic church in Seaford, N.Y. As many as 30,000 police officers from across the United States are expected to pay their respects at the Long Island funeral Friday for Moore. (AP Photo/Mary Altaffer) (The Associated Press)

SEAFORD, N.Y. – Noon

Thousands of police officers from around the country have packed a church for the funeral of a young New York City police officer who was killed on patrol.

Fellow officers carried Officer Brian Moore's coffin into the Long Island church, where the funeral Mass began Friday with hymns and readings. There was heavy security: A sniper stood on top of a police van as a hearse carried his body from a funeral home, and snipers watched from the roof of a nearby elementary school.

Authorities imposed a 3-mile no-fly zone overhead, and a Nassau County police helicopter was hovering.

The 25-year-old Moore died Monday, two days after he was shot in Queens. He and his partner were in an unmarked car and had stopped a man suspected of carrying a handgun when the suspect shot Moore in the head.

As many as 30,000 officers from across the country were expected at the funeral in Seaford.

Mourners also included New York's top elected representatives and relatives of Officer Wenjian Liu (WEHN'-jihn LOO'), one of two New York City officers killed in an ambush in December.