Two conmen pretending to be from the water board stole cash after tricking their way into a home in Stanwick.
Police are urging people to be vigilant and are appealing for witnesses after the distraction burglary in Cumberland Avenue.
The incident happened between 9pm and 9.30pm last night (Thursday).
A police spokesman said: "The suspects are described as two white men.
"One of them was about 50-years-old, of large build, about 5ft 4in, wearing a grey woolly hat and a navy blue jacket."
Witnesses or anyone with information should call Northamptonshire Police on 101.
The force spokesman added: "Please remain vigilant when cold callers knock on your door – verify their ID with the company directly, ask them to come back later and most importantly – if you’re not sure, don’t open the door."
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