Prosecutor Zuzana Hulinová launched a criminal proceeding based on a motion submitted by activist and teacher Juraj Smatana, the Sme daily reported.
Prime Minister Robert Fico published the documents in early February, alleging that OĽaNO chair Igor Matovič avoided a tax audit by selling his Region Press company for the equivalent of about €4 million to one of his employees while keeping the company’s money on his personal account and later withdrawing from the contract.

Fico refused several times to declare where he obtained the documents. They were, however, part of the files which he could not obtain legally as they can be shown only to participants in the proceeding held at the tax office, Sme wrote.
“With publishing the report from the tax office Fico violated the tax secrecy,” Pavel Nechala, a lawyer cooperating with Transparency International Slovensko watchdog, told the Denník N daily in February.
Though Fico had promised to publish the source of the documents together with other information against Matovič, this did not happen before the elections, Sme reported.