Nine people were killed and more than seventy injured on Monday evening when two trains on the Washington metro collided during rush hour.
The accident, in which a moving train ploughed into the back of a stationary train waiting near a station, occurred on the above ground section of the metro at 5pm local time.
Investigations are underway by the National Transportation Safety Board and Washington Metro officials into the cause of the accident.
Both trains were on the same track headed toward Shady Grove Metrorail station, according to preliminary reports.
“We are committed to investigate this accident until we determine why this happened and what must be done to ensure it never happens again,” said Metro General Manager John Catoe.
This is the deadliest accident in Metrorail’s 33-year history.