Two young girls were found dead at the Marcy Avenue and Broadway train station in Williamsburg early Saturday morning. Sources say authorities are investigating it as a subway surfing incident.

Video shows first responders on the scene just after 3 a.m.

According to police, a 13-year-old and a 12-year-old female were found on top of the train.

Neighbors told News 12 the J train is a popular line for subway surfing.

“It's heartbreaking. Every time I hear a story like this it's heartbreaking," said Raphael.

The identities of the victims were not immediately known.