One person has been killed and four others injured in a shooting at a gym in Washington, D.C., US.

Axar.az reports, citing NBC News, that one of the injured victims is in critical condition, while the other three sustained non-life-threatening injuries, according to interim Metropolitan Police Chief Jeffery W. Carroll.

The suspect was later found dead in a nearby apartment building from a self-inflicted gunshot wound. Police said officers had been speaking with him by phone while he was barricaded inside the apartment when they heard a gunshot and lost contact with him.

Authorities believe the suspect had been involved in a dispute with the homeowners' association of the apartment building. The motive for the shooting remains under investigation.

The shooting took place at the Vida Fitness gym near the intersection of 15th and P streets. The facility has been closed until further notice.