It was at two o'clock on Tuesday afternoon that the police were alerted to a big riot on the main street in Västerås.
The people are not left in the place.
Police have been there investigating the crime scene.
They are currently silent about what has happened.
- There has been some form of quarrel between people.
I can not say more than that at the moment, says Petra Blomqvist, press spokesperson at police region Mitt.
According to the patient injury report from Region Västmanland, the man is undergoing emergency surgery and is life-threateningly injured.