The Serious Fraud Office says it has accidentally sent thousands of pages of evidence relating to an investigation into defence giant BAE Systems to the wrong person.
A statement from the office said it identified the data loss in May and that 98 percent of the material has already been recovered.
The office said that none of the material related to matters of national security.
More top news
Reality TV star Amy Childs has confirmed the birth of her first child, declaring her baby girl "perfect".
Police are investigating a fatal shooting at a house in Ringwood after intruders were reported breaking into a house
A split set up in terms of weather this Sunday .