Fraud victims have criticised the police and a supermarket for doing nothing to prevent skimming machines being placed on cash machines.

Following yesterday's coverage in the Oxford Mail, many more people have come forward to say that their cards have been cloned after they used the cash machine outside the Tesco superstore at the Oxford Retail Park, in Cowley.

One victim from Cowley, who does not want to be named, is furious that the fraudsters are still getting away with it after she told police and supermarket staff on March 7 that £400 had been taken from her account.

She said: "They have done nothing about it whatsoever and we lost £400. Tesco and the police know it's going on.

"I think it's just disgusting. There is no point in reporting it because they don't do anything."

Another victim from Cowley, Debbie Sheppard, called her bank, the police and the supermarket after she used her card at the Tesco cash machine over the Easter weekend and quickly saw £410 disappear from her account.

But when she spoke to staff at Tesco, she was surprised to find that they were not interested.

She said: "I explained what had happened and before I had even finished, she said it was not their problem and that I needed to contact my bank."

She was told that staff were unaware of the problem, and that it was down to the Royal Bank of Scotland, which runs the machine in partnership with Tesco Personal Finance.

Ms Sheppard said she had been put off shopping at the store because they were not prepared to let people know that there was a problem.

She added: "It just seems to me that no-one wants to take responsibility for it."

A spokesman for Tesco apologised to Ms Sheppard. He said: "Clearly who she spoke to shouldn't have said that. They should have known the information. I can only apologise, but we were aware of it from April 15. It must have just been the people she spoke to."

He said it was standard procedure for security staff to check the machines hourly, and that would be done more regularly when something was reported to them.

The store also has CCTV, he said, and regularly places anti-skimming devices on the machines.

But he said: "The problem is that these devices are only attached for a very short period of time."

Tim Wiseman, spokesman for Thames Valley Police, said Tesco was probably being targeted because it was easy to access, busy and the fraudsters would be able to wait around nearby without being detected. He said: "It's difficult to speculate about who is responsible, but there is intelligence to suggest the larger organised crime gangs have been involved."

Mr Wiseman said it was important all victims of card fraud reported the crime so that police could draw up a picture of the gangs' activities.