Swedish police say at least 15 young women have reported being groped by groups of men on New Year's Eve in the city of Kalmar.
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.
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Asked about similarities to assaults in Germany, Bruun said "we are aware of what happened in Germany but we are focusing our investigation on what happened in Kalmar.