BAE Systems has said that it is "concerned" to hear of the data loss, but that it is "a matter for the Serious Fraud Office".
The defence giant also confirmed in a statement that the material was not sent to a current or former employee of the company.
We were concerned to hear of this unfortunate incident but understand it has now been dealt with by the relevant authorities. Ultimately, this is a matter for the SFO and as far as BAE Systems is concernedit is now closed.
More top news
Temperatures will drop after the rain finally gives way in the southeast, with just a few showers on the northwest coast.
A British Scrabble champion clinched the world title when he won a best-of-five showdown against a US opponent by three games to one.
Newly crowned double Formula One world champion Lewis Hamilton had a phenomenal season. Here is a look at his career and season in numbers.