Alnwick police inspector Paul Truscott is urging residents to be ‘on their mettle’ after reports from concerned householders about suspicious door-to-door salesmen.
Police have received a number of calls this week about men knocking on homes in Felton and Amble, offering to sell items such as cloths and dusters.
Inspector Truscott said: “As far as I am aware, nobody has done any transactions with these people, but residents have been ringing us about them.
“We believe this could be an intelligence exercise by this group and if you get any of these callers, treat them as you would, but be wary of them. If you do have your suspicions, then give the police a call.
“If they don’t have a pedlar’s certificate for Northumberland, they are committing an offence.”
Anyone with suspicions should call police on 101.