The Silver Spring Penguin

Two Red Line trains collided Monday afternoon, leaving nine people dead and 76 injured, The Baltimore Sun reported.

The crash occurred around 5:00 p.m. between the Takoma and Ft Totten stations, WMATA said in a press statement. The first train, which was headed towards Shady Grove, rear ended the second, which was stopped in front of it and waiting for the station platform at Ft Totten to clear, The Sun wrote.

Photographs showed the first train’s front cars pancaked on top of the second train’s rear cars, which were torn open.

Photo: One Red Line train stacked on another. Courtesy of Twitter user @jamescampbell.

The first train’s operator — Jeanice McMillan, 42, of Springfield, Va — was identified as one of those killed, The Sun wrote. The names of the eight other fatalities have not yet been made available.

Seventy-six more people were treated for their injuries, with two of them in life-threatening condition, Districe mayor Adrian Fenty said during a press conference Monday afternoon. But by Tuesday morning, one of the severely injured patients had been upgraded from critical condition, The Sun wrote.

What caused the collision is still unknown, but CNN reported Monday that high speed was a factor.

Investigators with the National Transportation Safety Board told The Sun they would look into the Metro system’s automated navigation system, which is supposed to keep trains from getting too close to each other.

It’s not known whether the navigation system failed, or if the first train’s operator manually overrode the system.