The stairs and elevator systems on some of New York City’s steepest streets were shut down on Monday as authorities searched for a man who had climbed into a stairway and killed three people.

The death toll from the collapse of the third-story balcony in the Manhattan borough of Lower Manhattan was at least two.

It was unclear whether anyone else had been injured.

The stairwells on the 14th Street corridor between Eighth and Ninth avenues in the Financial District were also closed for about three hours on Monday, the city said in a statement.

There were no injuries, it said.

The city has issued a safety alert to alert residents to the dangers of elevators and stairways and is taking steps to make sure the system works as it should, Mayor Bill de Blasio said in his weekly address to the city’s residents.

The cause of the collapse is under investigation.

The man who climbed into the stairwell was identified by the FDNY as Michael F. Farrar, 34, of Brooklyn, officials said.

He had been charged with three counts of second-degree murder and one count of manslaughter.

Police said the stairway was closed after he climbed up a ladder, jumped down and struck three people with a baseball bat.

All three victims died at the scene.

Farrar is from Brooklyn, but was born in the Bronx, according to the police statement.

His mother is in the United Kingdom, authorities said.

His father, Anthony Farrars, also a Brooklyn resident, was arrested in the New York suburb of North Attleborough in connection with the deaths, police said.

His bond was set at $250,000.FARRAR is a resident of Brooklyn who lives with his mother and two younger sisters, the FDOC said.