Police have discovered some material which was thought to be explosive when they searched for a suspect in an outbuilding at Bitterne Triangle in Southampton.
The incident happened around 11.30pm last night. A bomb disposal unit was called in to deal with the material.
A police spokesperson said the incident is isolated and involved no risk to the public.
A 28-year-old Southampton man was arrested on suspicion of making an explosive substance. He remains in custody at Southampton Central police station.
More top news
Philippa has the latest weather for the east
Philippa has the latest weather for the west
Nazanin Zaghari-Ratcliffe's five-year jail sentence is confirmed despite her husband's campaign to bring her home.