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UPDATE: The NYPD on Thursday released surveillance video that shows the suspect flash a gun to the teenager.

Original story:

VAN NEST, the Bronx — A rider opened fire on an MTA bus in the Bronx after an argument on Wednesday afternoon, police said.

The BX39 bus was near White Plains Road and Van Nest Avenue when a dispute escalated around 4:30 p.m., officials said.

According to the NYPD, a man believed to be in his 20s approached the 18-year-old and began asking him interrogating questions. Police initially told PIX11 the suspect was thought to be a 36-year-old man, but later updated that information.

Officials said the suspect then displayed a gun. The scared teen then contacted his uncle by cellphone and asked to be picked up at the next bus stop, police said.

According to authorities, when the bus stopped, the teen’s 35-year-old uncle held the back door open and told his nephew to come with him.

The suspect then confronted the uncle and a physical struggle ensued, police said. During the struggle, a firearm was discharged, striking the ceiling of the bus, according to the NYPD.

No one was struck by the bullet, police said.

The armed suspect hopped off the bus and fled, heading northbound on White Plains Road, officials said.

The NYPD described the suspect as a man in his 20s, standing 6 feet tall, weighing around 165 lbs. with black hair. He was last seen wearing a green bubble jacket, a green hooded sweatshirt and black and red track pants.

The NYPD later released the above surveillance images of the man they were looking for.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting crimestoppers.nypdonline.org, downloading the NYPD Crime Stoppers mobile app, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).