The Office of Personnel Management announced Wednesday that 5.6 million people are now estimated to have had their fingerprint information stolen.

That number was originally thought to be about 1.1 million, OPM said in a statement. About 21.5 million individuals had their Social Security Numbers and other sensitive information affected by the hack.

According to OPM, "federal experts believe that, as of now, the ability to misuse fingerprint data is limited." The office acknowledged, however, that future technologies could take advantage of this information.

An interagency working group—to include FBI, Department of Homeland Security and Defense Department representatives—plans to review the implications of the stolen fingerprint data, according to OPM.