Hackers gained access to personal information on more than 100,000 US taxpayers over the past four months, according to the US Internal Revenue Service (IRS).
From February to May, attackers used an IRS online service to steal tax return information on about 104,000 households, IRS Commissioner John Koskinen said on Tuesday.
The breach did not affect any IRS data outside the “Get Transcript” application, Reuters quoted Koskinen as saying.
The IRS official said he cannot on who the attackers might be, but assured that a criminal investigation was underway.
Meanwhile, he pledged to step up cyber security measures at the tax agency.
“We’re confident these are not amateurs. These are actually organized crime syndicates that not only we but everyone in the financial industry are dealing with,” Koskinen said.
The IRS was alerted to the problem due to unusual activity in mid-April, which marks the end of the annual tax-filing season.
– Contact us at [email protected]