Chaotic Scene On The NYC Subway As Two Men Brawl During Dispute Which Lead To A Knife Which Lead To One Man Shot In The Head

BROOKLYN, New York (WABC) -- A 36-year-old man armed with a gun is in critical condition after police say he provoked another man on a subway train in Brooklyn, and was then shot by his own weapon.

The shocking encounter was caught on cellphone video inside a northbound A train around 4:45 p.m. on Thursday.

Police say a 32-year-old man boarded the train at the Nostrand Avenue Station.

As the train started moving, police say he was approached by a 36-year-old man who was already on the train. Witnesses described the 36-year-old as aggressive and provocative towards the 32-year-old man.

The two exchanged words, which turned physical and led to the 36-year-old to take out a knife or a razor blade.

Police say the 36-year-old put the sharp object down and that's when he retrieved a gun from his jacket.

The 36-year-old started to walk toward the 32-year-old with the firearm, in a menacing way, which is when the fight once again turned physical.

During the physical altercation, the gun taken from the 36-year-old by the 32-year-old, who then fired shots, striking the 36-year-old aggressor in the head.

Cellphone video captured the dispute between the two men, and the frantic moments as passengers scrambled to safety when the shots rang out. One woman can be hear screaming, "let me out, let me out!"

The train then pulled into the Hoyt-Schermerhorn station, where officers heard the shots and flooded the crime scene.

The 36-year-old was taken to NewYork-Presbyterian Brooklyn Methodist Hospital in critical condition.

Authorities says a gun was recovered at the scene.

The 32-year-old is in custody and is being questioned by police. No charges have been filed at this time.

An investigation is underway.