31 year old victim taken to hospital after attack on Thursday night.
Cash Point Scam
Northamptonshire Police is warning about a "glue trap" that criminals are using at cash points in the Northampton and Daventry areas.
The device, similar to a piece of car trim, is pressed over the slot where money come out. The customer waits for the cash which never materialises and they then take their card and leave.
The cash, which has become stuck to the back of the cash trap, is then removed by a fraudster who pockets the cash.
PC Julia McLeod, of Northamptonshire Safer Community Team, said: "Several incidents of this nature have been reported to us, mainly in the Northampton and Daventry areas.
"This fraud is becoming a national problem and we would ask anyone using cash points to check the machine they are using and to be aware of their surroundings.
"The device is neat and cleverly constructed and has netted criminals quite a bit of cash in recent weeks.
"If you have any concerns about the cash point that you are using, move away and use another one.
"Please report any concerns to the bank in question or contact the police on the 101 non-emergency number."
Both robberies happened within 20 minutes of each other on Wednesday night.
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David Russell met his American victim on social media in 2009.
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