The Associated Press

WASHINGTON (AP) - A sixth person who worked at the State Department has pleaded guilty to sneaking a peek at celebrity passport files.

Former State Department employee Karal Busch admitted Wednesday that, out of curiosity, sheillegally looked at more than 64 passport applications submitted by famous Americans.

The files contain a photo of the applicant and personal information protected by federal privacy laws. State Department employees are only supposed to access them for official government reasons.

An investigation began in March 2008 after officials discovered unauthorized access of the files for then-presidential candidates Barack Obama, John McCain and Hillary Rodham Clinton.

Busch is a 28-year-old resident of District Heights, Md.