POLICE are appealing for help to catch criminals who have been targeting vulnerable residents across Richmondshire and Hambleton.

Despite repeated warnings urging the public not to let strangers into their homes, the crimes have proved quite lucrative for the gang who target elderly people.

They have netted about £6,000 worth of property so far this year in 11 reported incidents.

"The usual method is that they will explain that they are testing the water in the area and ask the householder to turn on a tap and wait to see if the water stops or changes colour," said Detective Ser-geant Richard O'Neil.

"They in turn check the bathroom - while one searches other rooms in the house for valuables. Once they have finished, the householder is told everything is all right and they leave."

Yorkshire Water said its employees will usually make an appointment before testing the water supply, and all officials from the utility services carry identification cards which can be checked by making a single telephone call.

"If necessary, leave the person outside while you check if there is an official working party in your area. If you are still not happy, refuse entry and call the police," said Sgt O'Neil.

The police are also urging communities to make life harder for opportunist thieves by taking a more active interest in what goes on in their street. "These are despicable crimes, in which the culprits deliberately prey on the vulnerable," said North Yorkshire police spokesman Tony Lidgate.

"We would be happy to see a return to the days when neighbours looked out for each other. In other words, if you see a stranger knocking on an elderly person's door then go and mind someone else's businesses. Better that than discover a neighbour has been the victim of another burglary, or worse.

"We think gossip - or taking an interest - is to be encouraged. A community grapevine is how people hear about what has been going on in their area. If it means they are forewarned about criminals like these, then that has to be a good thing."