C Train Track Mini Blast View Full Caption YouTube/Dj Hammers

BEDFORD-STUYVESANT — The MTA is investigating reports of teens putting metal onto subway tracks after a video posted online showed a small blast on the C line.

A YouTube video shows a mini explosion after the train hits an object while pulling into the Nostrand Avenue station.

Officials said they believe the incident occurred on Thursday morning around 8 a.m. The recording was first reported by Gothamist.

The MTA is working with the NYPD to identify those involved, according to a spokesman.

“If this video really depicts what it claims, it is unconscionable that vandals would have deliberately endangered the lives of our customers and employees, as well as delayed thousands of customers during the morning rush,” the agency said in a statement.