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
Police in Beirut are investigating the sudden death of British embassy worker Rebecca Dykes, government sources said.
A tip from the CIA was sufficient to track down and detain a group of suspects planning to bomb the Kazan Cathedral and other sites.
The 12 Years A Slave director is filming an artwork as a 'lasting memorial' to the Grenfell Tower fire tragedy.