There's no telling yet how big the cyber attack against the federal government revealed last week may be.

FOX News Radio's Jill Nado reports: 

The Director of the Office of Personnel and Management getting slammed by Republican Congressman Jason Chaffetz of the House Oversight committee for not protecting data.

(Chaffetz) "You failed utterly and totally."

House Oversight and Government Reform Committee Chairman Rep. Jason Chaffetz, R-Utah speaks on Capitol Hill in Washington, Tuesday, June 16, 2015, during the committee's hearing  on the Office of Personnel Management (OPM) data breach. In the cyberattack targeting federal personnel records, hackers are believed to have obtained the Social Security numbers, birth dates, job actions and other private information on every federal employee and millions of former employees and contractors. (AP Photo/Cliff Owen)
House Oversight and Government Reform Committee Chairman Rep. Jason Chaffetz, R-Utah speaks on Capitol Hill in Washington, Tuesday, June 16, 2015, during the committee's hearing on the Office of Personnel Management (OPM) data breach. In the cyberattack targeting federal personnel records, hackers are believed to have obtained the Social Security numbers, birth dates, job actions and other private information on every federal employee and millions of former employees and contractors. (AP Photo/Cliff Owen)

And OPM has said about four million former and current fed workers had their data hacked, but further investigation shows it was more. However, OPM Director Katherine Archuleta won't say how many or even who.

(Chaffetz) "Does it include military personnel?"

(Archuleta)"I would be glad to discuss that in a classified setting."

(Chaffetz) "Does it include contractor information?"

(Archuleta) "Again, I would be glad to discuss that in a classified setting."

Archuleta also accused of ignoring warnings about potential cyber attacks going back as far as 2007.

In Washington, Jill Nado, FOX News Radio.