The glittering skyscraper where hundreds work became the scene of New York City’s deadliest gun attack in 25 years when a man entered the lobby and started shooting.

NEW YORK — Aland Etienne, the security guard murdered in a mass shooting committed by Park Avenue shooter Shane Tamura after spending the final moments of his life trying to save others, was laid to rest Saturday.

A New York City office building where a gunman killed four people then himself has reopened a week after the deadly shootings. On Monday, workers trickled back into 345 Park Avenue in Midtown Manhattan, a skyscraper home to high-profile tenants including the NFL and asset management firm Blackstone.

A suspect was spotted entering the Blackstone building holding an assault weapon. Get updates on the developing situation.

A shooter killed five people and injured six at 345 Park Avenue before taking his own life, via the New York Post. At least one of those killed was a police officer. Per the report, authorities expect the number of victims to rise as the 44-story building is searched in the aftermath of the incident.

The lobby of 345 Park Avenue will reopen for the first time since last Monday's mass shooting that left four innocent victims dead.

Aland Etienne, a security guard killed in the New York City office building mass shooting, was laid to rest after a funeral in Brooklyn.

Family, friends and colleagues packed the Guarino Funeral Home in Brooklyn on Saturday to lay to rest hero security guard Aland Etienne, after he was killed on the job at 345 Park Ave. “Aland made the ultimate sacrifice,