The Swedish reports follow a string of sex assaults and robberies during New Year's celebrations in Germany.
Kalmar police spokesman Johan Bruun on Friday said groups of men encircled women on a crowded square and groped them. He said no one was physically injured but that many of those targeted were terrified.
He said two men, both asylum-seekers, were informed through interpreters that they're suspected of sexual assault and that police are trying to identify other suspects.