U.S. OPM Chief Rebuffs Lawmakers on Scope of Cyber Breach

The head of the Office of Personnel Management refused on Wednesday to estimate how many millions of Americans were affected by recent hack attacks on her agency's computers, but rejected as premature reports 18 million were compromised. OMP Director Katherine Archuleta conceded the number of people whose data was hacked could increase from initial estimates. OPM said this month it was victim of a cyber attack involving personnel data of 4.2 million current and former federal employees.