A man was killed after a shooting unfolded on the DC Metro Sunday morning, and authorities are searching for the suspected shooter, police said.

The shooting occurred around 11:45 a.m. on a Green Line train at Navy Yard station, according to a tweet of the Metro Transit Police. The station is located in the Capitol Riverfront neighborhood and 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.

in a tweetDC police said officers are searching for a slim man between the ages of 25 and 27, dressed all in black, with curly hair and in possession of a silver or gray gun. They added that the station was conducting an investigation, in the 1100 block of New Jersey Ave SE.

More information about the circumstances surrounding the shooting and the victim was limited. A representative of the Metro Transit Police directed questions to the Metropolitan Police Department.

DC Police Officer Makhetha Watson told NBC News that investigators from the violent crimes bureau and homicide unit were on the scene, but the department had yet to receive a report of a death shortly after 1 a.m. pm EST.

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.