The Swedish Prosecution Authority says the investigation was "at an initial stage" and should be decided by midday Saturday, whether A$AP Rocky - real name Rakim Mayers - should be formally arrested. His three body guards are suspected of lesser degrees of assault under Swedish law.
In a statement, the authority said the four were detained Wednesday because they would leave the country and avoid prosecution. No further information was available.
Swedish media said the fight occurred Sunday before A$AP Rocky performed at a music festival in Sweden. It was not known who else was involved in the fight on a central Stockholm square.
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