A uniformed U.S. Park Police officer was involved in a shooting Wednesday afternoon at 12th and M Street in Northwest D.C., authorities say. 

DC Fire and EMS spokesperson Vito Maggiolo said a call came in around 2:30 p.m. for two people shot. 

Both were being transported to local hospitals. Their conditions weren't immediately clear. 

Local reports say multiple shots were exchanged and the suspect is in cardiac arrest. A gun has been recovered at the scene. 

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No further details were immediately available. 

This is a developing story. Check back for updates.