NEW YORK, April 6 (UPI) -- New York's Metropolitan Transportation Authority is investigating a video of a small explosion in a subway tunnel allegedly caused by teens placing metal on the tracks.
The video, filmed last week and shared repeatedly on Facebook, shows a small explosion occur as a C train pulls into the Nostrand Avenue station.
Comments on the video indicated the metal object on the tracks appears to be a rollsign box, a feature found on some older trains.
A subway motorman who shared the video on Facebook alleged the teens who placed the rollsign box on the tracks were the same culprits behind a previous video showing a teenager receiving an electric shock while putting a sign on the tracks at a subway station in February.
The MTA said it is investigating the incident alongside the New York Police Department.
"It is outrageous that these people endangered the lives of our employees and customers with this prank," the MTA said in a statement provided to the Gothamist. "This incident was not only extremely dangerous but it also affected service for more than an hour during the morning rush, disrupting the commutes of thousands and thousands of customers. We are working with NYPD to find these perpetrators."