The
company, Tad Group, has become a focus of the investigation.
Another of its employees, Kristian Boykov, is the only person so
far charged with involvement in last month's cyber attack on the
tax agency, in which nearly every Bulgarian adult's financial
records were compromised.
Boykov, 20, has denied wrongdoing. He has been released from
custody but banned from leaving the country.
Police and prosecutors searched Tad Group's premises on Tuesday.
"One senior manager has been taken in for questioning. He is
being detained for 24 hours," an interior ministry spokeswoman
said. She did not identify the person detained.
Prosecutors have said they believe Boykov did not act alone and
were now looking for instigators of the attack and contractors
they used.
Prosecutors believe he was behind an email sent from someone
purporting to be a Russian hacker who was offering stolen tax
agency files to local media. They do not currently believe the
attack came from abroad.
The tax agency is facing a fine of up to 20 million euros($22.5
million) over the breach, which officials have said compromised
about 3% of the agency's database.
According to financial newspaper Capital, the leaked data also
included files from the EU's anti-fraud network EUROFISC, which
allows national tax administrations to share information on
fraudulent activities and combat organized VAT fraud.
(Reporting by Tsvetelia Tsolova; editing by John Stonestreet)
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