A man has been arrested on suspicion of making or possessing an explosive substance in Derby, as more than 50 houses were evacuated in the area.
The military was sent to the scene after officers carried out a warrant in King Alfred Street, Normanton, at about 11.30am on Sunday.
A man has been arrested and remains in police custody, but there is no indication it is a terror-related incident, Derbyshire Police said.
A statement from the force read: “The Explosive Ordnance Disposal team are on site and a number of houses are currently being evacuated in King Alfred Street, Monk Street and Wolfa Street.
“Residents are asked to stay away from the area and those evacuated will be contacted when it is safe to return to their homes.”
In a later update, the force said the incident is likely to continue into the evening as officers work with the Explosive Ordnance Disposal team.
It continued: “The force is liaising with Derby City Council to help those who require temporary accommodation while they are currently unable to access their homes.
“Residents who have been evacuated will be contacted once it is safe to return.”