Police are warning elderly residents to be vigilant after Southbourne pensioners gave money to a young man claiming he was locked out of his house.
Dorset Police Constable Rob Bentall said: "This man appears to offer a similar story each time he attempts to trick a victim. He says that he needs around £30 for a locksmith, because his landlord has supposedly locked him out of his flat."
The incidents which have been happening since February.
The man is described as being in his early twenties with short brown hair, slim build and around six feet tall.
There are no reports about any violence or threat against residents.
PC Bentall explained: "This man is preying on elderly members of the community and I am also urging members of the public to keep a look out for their vulnerable neighbours and report any suspicious activity."
At the time of the offences he was clean and tidily dressed. He has a healthy complexion and is said to be well spoken.
"I would like to remind home owners, particularly our more vulnerable residents, to be vigilant at all times. Anyone who is approached in similar circumstances should contact Dorset Police as soon as possible", PC Bentall said.
The police asks anyone who has any information about these incidents or any other similar scams to contact Dorset Police in confidence on 01202 222 222 or the Crimestoppers line on 0800 555 111.