A TEENAGER has been arrested after three people were gunned down in a horror attack at a hair salon in Sweden.
The 16-year-old has been detained on suspicion of murder after gunfire erupted in the centre of Uppsala on Tuesday.
A major police operation was launched after shots rang out at Vaksala Square in broad daylight.
Police, who confirmed three had been killed, said the attack was staged by a masked gunman.
Cops are still investigating several other suspects after one allegedly escaped on an electric scooter.
A number of other people have been brought in for questioning since.
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Cops said in a statement that they had received calls from members of the public who said they had heard noise that sounded like gunfire in the centre of the city.
"Several people have been found with injuries that indicate gunfire," the police said.
A large area was cordoned off, and several investigative measures were underway at the scene, they added.
One witness told the local media outlet : "There was a shot and then I heard screams."
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Another witness said: "I saw [the suspect] come around a corner and then it started banging."
Cops are yet to reveal the motive behind the attack.
Police spokesman Magnus Jansson Klarin said: "We have three people confirmed dead, but we have not confirmed their identities.
"We received reports of a masked person on an electric scooter, we are looking into those reports."
Swedish media said witnesses heard several shots at a hair salon in the centre of the city.
The SVT public broadcaster said one of the dead had been a suspect in an investigation into a planned attack against a relative of a gang leader, Ismail Abdo.
Uppsala's mayor Erik Pelling said he was "shocked and dismayed" by events.
"I am also angry that it could happen," he added.
"We are forced to live with these crimes. I am frustrated that we have not been able to tackle this problem more effectively," Pelling said.
Sweden has suffered from a wave of gang-related violence for more than a decade that has included an epidemic of gun violence.
In February, 10 people were killed in the Swedish city of Orebro in the country's deadliest ever mass shooting.
A 35-year-old unemployed loner opened fire on students and teachers at an adult education centre.
Sweden - a land that spawned the joyful music of Abba and dependable brands Volvo and Ikea has now become a byword for ultra-violence.
More than 30 bombings rocked the country in January, mostly aroundthe capital Stockholm, as ruthless drug gangs vied for supremacy.
Many of those involved are baby-faced hoodlums killing for cash and misplaced street credibility.
Prime Minister Ulf Kristersson admitted: “We don’t have control over the wave of violence.”
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And the Swedish underworld is exporting its mayhem.
In four months last year, at least 25 young Swedes on suspected contract-killing or bombing missions were arrested in neighbouring Denmark.