Authorities in Denmark, Estonia, Britain and the United States are investigating payments totalling 200 billion euros ($229 billion) made through the Danish bank's tiny Estonian branch between 2007 and 2015.
"Six people had been detained by the criminal police on Tuesday and an additional four on Wednesday morning," the Estonian prosecutor said in a statement.
At a news conference, Estonia's head of criminal police Aivar Alavere said the 10 people, all Estonian citizens, detained by police on Tuesday and Wednesday, are suspected of being part of a network that facilitated flows of dirty money through Danske Bank's branch in Estonia.
He said the number of arrests was likely to increase.
The bank had also reported eight former employees to the Estonian police.
Danske could not confirm on Wednesday if the 10 detained people were among the employees already reported to Estonian authorities, a spokesman said. He had no further information about the arrests.
(Reporting by Tarmo Virki; additional reporting by Jacob Gronholt-Pedersen and Stine Jacobsen; editing by Jason Neely and Jane Merriman)
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