Documents belonging to an elite crime-fighting team - including one headed 'threats to the UK' - have been discovered strewn across a field by a woman walking her dog.
The papers were being stored in an officer's car was taken by thieves from outside a Greater Manchester house.
And a laptop taken from the same vehicle, containing password-protected and encrypted information, is missing after the raid.
The computer and documents belonged to an officer from the Serious and Organised Crime Agency (SOCA), an intelligence-led body that focuses on areas like drug-trafficking and money-laundering.
SOCA has launched an investigation into how the items were stolen and are reviewing their security procedures.