A young man was injured in a fight on Kvarnängsgatan near a fast-food restaurant.
The alarm was raised to the police about a larger fight outside the fast-food restaurant shortly after midnight.
There are reports in the investigation that several people were involved in the fight, 5-10 people.
A young man came to the emergency department in Uppsala with a stab wound and sought care. When the police came into contact with the man at the emergency department, he was awake and able to speak.
The police have information to work with in the investigation.
People have been interrogated who can be thought to provide information in the investigation.
No person is detained in the matter.