The man who shot several people in D.C. killed one person and later himself has been identified as an emergency room doctor ... who was locked in a dispute with his homeowners' association.
The shooter, Dr. Matt Lambert, opened fire Thursday morning in the VIDA Fitness gym next door to his building, where he killed 1 person and injured 4 others.
At least six people have been shot in D.C. as police and other law enforcement agencies respond to the active shooter situation near Logan Circle ... with the shooter barricaded inside an apartment building.
The Metropolitan Police Department wrote on X ... "CRITICAL ALERT: MPD is on the scene of an ACTIVE SHOOTING in the area of 15th and P Street, Northwest. MPD's Emergency Response Team is on scene."
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As of now, no suspect is in custody, police spokesperson Nicole Deaner said. However, the shooter is apparently holing up inside a high-floor unit in a residential building ... NBC reported.