Teenager killed, police officer and two adults wounded in shooting at US concert

The scene of the shooting in Washington DC.

Screengrab/Twitter The scene of the shooting in Washington DC.

A 15-year-old boy has been shot to death and three adults - including a police officer - wounded in the US after a musical event lacking a permit erupted into chaos on a street in Washington DC on Sunday night (local time), police have confirmed.

The wounded police officer and the other adults were recovering at hospitals, Metropolitan Police Chief Robert J. Contee III told reporters at the scene of the shooting.

The incident took place near 14th and U Streets NW, just more than 3km north of the White House.

Social media had promoted a free music event known as Moechella and several hundred people were gathering in the area around 6pm, Contee said. Police arrived to assist the crowd and people stayed mostly to the sidewalks as music played from a truck.

In the hours that followed, a fight broke out and then an incident of an undetermined nature caused people to scatter, Contee said. Police shut down the gathering, he said, because the event appeared to have become unsafe.

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Several people were hurt in the rush to leave the area and were being assisted by public safety first responders when the shooting occurred, Contee said.

He said the events took place between 6pm and 8.30pm.

A handgun was recovered from one of the victims but not the firearm believed to have caused the death and injuries, Contee said.

No police fired their weapons and there was no exchange of gunfire, he added.

The police chief said officials would be speaking to event organisers and considering what legal action could be taken because the event lacked a permit.

"We will certainly want to make sure that people are held accountable when they hold unpermitted events in our city," he said.

AP