The bank is already under investigation by Swedish and Estonian financial watchdogs, which on Tuesday said they had advanced their investigations by opening formal sanction cases against the bank.
Sweden’s oldest retail bank earlier this year dismissed its CEO and accepted the resignation of its chairman after its Estonian business was caught up in dirty money allegations that have engulfed Danish peer Danske Bank.
“Based on the current information Estonia was possibly used as a transit country in a money laundering scheme,” it said in a statement.
It also said no person had been charged with a crime at this point in the investigation. The prosecutor’s office declined to give further comments.
Estonia has earlier said its investigation of Swedbank activities were part of an investigation into Danske Bank money laundering in Estonia.