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One person, including a police officer, was killed and several others were injured in a shooting in Washington DC on Sunday.

A spokesman for the Metropolitan Police Department told Fox News that four people were shot at the Mocha event, including a police officer who did not fire at crowded places.

Chief of the Metropolitan Police Department Robert J. County III said the victims later included a 15-year-old man who was pronounced dead at the scene, along with two adults and an officer.

At least four people have been injured in a shooting on U Street in Washington DC

At least four people have been injured in a shooting on U Street in Washington DC
(WTTG)

The MPD officer was shot in the lower extremity and is expected to be alive, the chief said. The adults were taken to a local hospital.

The upscale DC-area mall was evacuated after the shooting, Virginia police said

Chief Conte said the shooting occurred at about 6 p.m.

At least four people have been injured in a shooting on U Street in Washington DC.

At least four people have been injured in a shooting on U Street in Washington DC.
(WTTG)

“We need to make sure that individuals are held accountable for their actions,” Conte said.

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Video from the scene of the shooting shows officers helping several people lying on the street.

At least four people have been injured in a shooting on U Street in Washington DC

At least four people have been injured in a shooting on U Street in Washington DC
(Mir EmirSX / Twitter)

The police chief further said, “When you have large gatherings in densely populated areas, it only takes one person with a gun to create this dangerous atmosphere.”

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Conti also said police officers had seized several illegal firearms the night before and that at least one gun had an extended magazine. The gun used on the officer was not confiscated, he said.

Mayor of Washington, D.C., Muriel Bauer, also spoke to reporters and called for “accountability” for those responsible.

“We have a child who was killed in an event that was not properly planned, involving people with guns,” Bozer said. “Despite police managing the crowd at the scene, someone used a gun and now a child has died.”

“We need some responsibility here,” she added.

At least four people have been injured in a shooting on U Street in Washington DC

At least four people have been injured in a shooting on U Street in Washington DC
(WTTG)

The marketing of the event assured the MDP that a strong police response would be needed and more than 100 officers were sent to monitor it, Conti said.

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Several people, including a police officer, were injured in Sunday's shooting in Washington DC.  (Credit: ESEWINNOVATIVE)

Several people, including a police officer, were injured in Sunday’s shooting in Washington DC. (Credit: ESEWINNOVATIVE)
(SEWINNOVATIVE)

This is a developing story. Check back for updates.