Police have carried out checks on vehicles outside a Derbyshire prison following complaints from local residents about suspicious activity.
Eight vehicles were stopped over the weekend at HMP Sudbury by officers searching for prohibited items including alcohol, drugs or weapons.
The patrol was aimed at preventing items being left outside for collection or thrown over the boundary fence.
None were found, but police said "valuable intelligence" was gathered.
Sgt Steve Edwards said: "We hope the community can be reassured by the operation that we are taking action to address their concerns, which we do by working closely with them, the prison governor and staff.
"High visibility patrols towards the end of the operation will have also sent a message to any potential offenders in the area and acted as a deterrent to any planned illegal activity."
Anyone who sees suspicious behaviour outside the prison should contact the Derbyshire force.