Police say they fatally shot man who advanced on them while wielding a butcher's knife in Lower Manhattan

An investigation is underway following a deadly police shooting in Lower Manhattan on Sunday afternoon.

The NYPD said officers were responding to multiple 911 calls about a slashing when the shooting happened just after 4 p.m. inside an apartment building at 126 Ludlow St., between Delancey and Rivington streets. Police said a man wielding a butcher's knife advanced toward officers, prompting them to open fire, killing him.

It's unclear exactly how many shots were fired.

A knife was recovered at the scene, police said.

The suspect, identified as 54-year-old Wei Chan, was transported to Bellevue Hospital, where he was pronounced dead.

Police said Cheung Chan, the suspect's 75-year-old father, was taken to Bellevue with a laceration to the head. He is expected to survive. It's unclear what started the altercation with his son.

Responding officers were also taken to an area hospital for evaluation.

The department's Force Investigation Division is in the early stages of its investigation.

At an evening news conference, NYPD Assistant Chief Melissa Eger, the commanding officer of Patrol Borough Manhattan South, walked reporters through the series of events she says led up to the shooting.

"This incident demonstrates the courage our officers display when answering calls for help," Eger said, later adding, "Their actions are a reminder of how officers run towards danger and not away from it."

The assistant chief said responding officers saw a trail of blood leading up a staircase, adding they then encountered the suspect descending the stairs and holding a large butcher's knife. Eger said officers repeated multiple commands for the man "to show his hands in an effort for him to drop the weapon."

However, Eger said the man continued to advance toward the officers, who then discharged their weapons.

Eger also said the entire incident was captured on officers' body-worn cameras. Commenting on the shooting on social media, Mayor Zohran Mamdani said the footage will be released to the public.

Eger said the suspect had no known criminal history with the NYPD but did have a documented mental health history.