Residents in a block of flats in Chesterfield have been evacuated after a man was arrested and a device was found nearby.
Emergency services and the Ministry of Defence are at the scene.
If follows officers being called to the block of flats off Devonshire Close in Newbold at around 2am this morning to concerns for the safety of a man.
A 25 year-old man was arrested and a device was found in an outhouse at the rear of the flats.
Enquiries are continuing.