Police in southern Sweden said that several people have been injured in a small town known for past gang violence and that the incident was not being investigated as terrorism.
Police said two of the injured were hurt during a shooting last night and that a total of four people were taken to the hospital.
They said there was nothing about the outbreak of violence in central Trelleborg to suggest it was terror-related.
Police say a K-9 unit is searching for weapons and officers are interviewing witnesses. No suspects are in custody.
Trelleborg is the southermost town in Sweden. The shooting happened in the centre of the city, which is home to around 30,000 inhabitants.
The Express quoted a Swedish police spokesman as saying: "We have received several reports of a shooting in Trelleborg.
"When we arrived at the scene, several people with gunshot injuries were found.
"We are blocking certain areas and will conduct an investigation.
"I do not have any more information at this time. But we are at the scene and investigating."
According to initial reports people were shot at multiple locations.
One witness told The Express: "There were many shots. We saw someone running outside. It's packed with police cars in the street."
Another said: "I was at home at my computer when I heard a loud bang."
People have been advised to avoid the area which has been cordoned off. A forensics team and canine unit have been sent to the scene.