Mayo Gardai are urging members of the public to be on alert for a man impersonating a Garda.
The man has called to the homes of two elderly people, in the Bohola and Castlebar areas, over the past 10 days, posing as a detective sergeant from Castlebar and enquiring if the householders have cash or valuables in their home.
The man is described as between 40 and 50 years of age, about 5 foot 8 in height and well-dressed.
Mayo Crime Prevention Officer Sergeant Tony Cosgrove, says this is a conman, and people should be on alert.
He says callers should always be asked for identification, and if in doubt, the householder should contact their local Garda station.