A man was killed after a shooting unfolded on the DC Metro, police said Sunday.

The shooting occurred on a Green Line train at the Navy Yard station, according to a tweet of the Metro Transit Police. The station is located in the Capitol Riverfront neighborhood, less than a quarter mile from Nationals Park.

“Unfortunately, despite lifesaving measures, the adult male victim was pronounced deceased at the scene,” Metro Transit Police said in the tweet.

More information about the circumstances surrounding the shooting and the victim was limited. A Metro Transit Police representative directed NBC News’ questions to the Metropolitan Police Department, which could not immediately be reached.

Green Line trains will be delayed and will not stop at Navy Yard while police investigate, according to Metro’s Twitter account.

This is a developing story. Please check for updates.