In a statement, police said they had received several calls from members of the public to report noises that sounded like gunfire.
Swedish police say three people were confirmed dead after a shooting attack took place on Tuesday in Uppsala, a city near the capital Stockholm, and are investigating the incident as a murder.
Swedish media reported that a manhunt to locate the perpetrator is ongoing. Eyewitnesses say the gunman reportedly fled the scene of the attack on an electric scooter.
Police said in a statement that they had received calls from members of the public who reported hearing loud bangs reminiscent of gunfire in central Uppsala, a university city located north of Stockholm, the capital.
Photos of the scene showed police outside a barber shop called “Shalom”.
A large area was cordoned off by police as they launched an investigation.
Local resident Nina said she felt "uncomfortable" because the attack happened in a residential neighbourhood right next door to where she lives, in an area where children frequently play.
"I find it uncomfortable, because I mean especially when, you know, we drive past this one. I picked up my partner just before we drove past here. We live next door and I think there are children and young people in these areas. I find it very uncomfortable,” said Nina.
There was no immediate indication of motive, and the police statement did not provide details about a suspected perpetrator.
Sweden has grappled with gang violence for years, which has resulted in frequent shootings and bombing attacks.