The NYPD is investigating the fatal shooting of a 15-year-old, identified as Jayjon Burnett, on a subway heading to Far Rockaway on Friday afternoon.

At a news conference hours after the shooting, NYPD Chief of Transit Jason Wilcox said two groups were arguing on a southbound A train at 3:45 p.m. That dispute escalated between the Beach 25th and Far Rockaway-Mott Avenue stations, and Burnett was shot in the chest, Wilcox said.

When the train pulled into the station, an injured Burnett was pulled off the train by a Good Samaritan, Wilcox said. Two police officers patrolling the station at the time responded and administered CPR until the EMS arrived, according to Wilcox.

Burnett was then transported to Cohen’s Children Medical Center, where he was pronounced dead, according to Wilcox.

Police section off the turnstile at the Far Rockaway-Mott Avenue subway station in Queens following the shooting of a 15-year-old boy.

Police have arrested and charged 18-year-old Keyondre Russell in connection with the shooting.

This is the eighth homicide within the subway system so far this year, according to New York City Transit Authority President Richard Davey, who was at the news conference adding that arrests have been made in the previous seven. He emphasized that this was not a random act of violence, suggesting the transit system is safe.

“We obviously have work to do, there's no doubt about it. I take the subway every day, taking it home tonight, so hopefully that gives folks confidence that that's how I believe in it,” Davey said. “But we got to stop this … it looks like this was not a random attack.”

Anyone with information was asked to call NYPD’s Crime Stopper Hotline at 800-577-TIPS.

This story has been updated with comments from NYPD Transit Chief Jason Wilcox and New York City Transit President Richard Davey, as well as the victim's name. It was also updated to include that an arrest had been made in connection with the shooting.