The Pentagon has admitted that a foreign intelligence service stole 24,000 files from a US defence contractor earlier this year.
The US Defence Department's head of cyber warfare isn't saying which contractor was holding the data or which country stole it.

But he says over the past few years information about some of the Pentagon's most sensitive programs has been pilfered from military contractors.

The admission came as the US Defence Department announced a new cyber warfare strategy aimed at securing the military's secrets.