Stones have been thrown at police and rescue services and three police officers have been taken to hospital after the riot in Skäggetorp in Linköping.
Several police cars have been damaged and in connection with it police uniforms were stolen.
"Violent and chaotic situation"
Pictures on social media show a man walking around in a police jacket and another wearing a yellow police vest.
- It has been a violent and chaotic situation today.
There have also been burglaries in the cars and bags with police equipment have been stolen, says police spokesman Johnny Gustavsson.
Unauthorized persons can walk around in police uniforms
The police are said to have recovered a large part of the equipment, but can not answer whether unauthorized persons are currently walking around with police uniforms.
- It is unclear, but not impossible.
However, it is a crime in itself to pretend to be a government official.
Several people have been taken into care, but I can not answer if anyone has walked around in a police jacket, says Johnny Gustavsson.