The first arrest was made shortly after 11 a.m. on Sunday in the Sala Backe district.
Photos from the scene show a person dressed in medical clothing and a plastic apron being taken away. However, police declined to give further details or say what crime was suspected.
No, unfortunately. The only thing I can say is that eight people have been arrested, Emil Sandberg, a duty officer at Uppsala Police, told TT in the afternoon.
The Swedish Prosecution Authority later announced that one man had been arrested on suspicion of aggravated assault. The other seven have been released, but remain suspects.
Police have declined to provide information about any potential victims.
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