BOGUS water repair men robbed a man and his elderly mother.
The three-strong gang rifled through drawers after conning their way into John and Dorothy Gawthorpe’s house in Denby Dale before fleeing with hundreds of pounds.
The callous raid, on Gilthwaites Crescent, happened just days after a couple in Newsome were attacked in almost identical circumstances.
Police are not ruling out a link.
Dorothy, 88, said: "I’m a bit shaky.
"It almost makes you feel dirty when they come into your house and go through your things. It’s not nice."
John, 61, who is epileptic, added: "I feel a bit like the village idiot for letting it happen.
"People need to be careful and stick to their guns and insist on seeing ID if they get dodgy characters knocking on their doors like this."
John and Dorothy were at home on Thursday when the three men knocked on their door at about 2pm claiming to be from the water board.
Retired clerical assistant John said he initially asked to see identification, but let the men in when they started complaining about him being "awkward".
While two of the men went into the kitchen and pretended to check the water supply by filling a bucket, the third tiptoed upstairs.
John said: "My mother thought she could hear some rustling going on upstairs and was going to go up when one of them shouted her back into the kitchen.
"I went up and two doors were open, which I knew had been closed.
"In my room one of the drawers was open and everything was scattered over my bed.
"I went into my mother’s room and he was standing there looking through her drawers.
"I asked him what he was doing and he tried to fob me off and told me I needed to keep an eye on one of the others. He said: ‘He’s a thief’.
"But I stayed in the room and challenged him again and he said: ‘If you don’t stop I’ll punch your face in.’"
The thief took a purse containing cash as well as cheque and bank books.
John tried to grab him as he left the bedroom but was knocked to the ground before the gang fled.
The incident happened two days after two men posing as Yorkshire Water workers stole £2,000 from a retired couple on Barcroft Road in Newsome.
Police have reiterated warnings to householders to take precautions to stop becoming victims themselves.
Det Con Russ Conlon said: "We are not ruling out the possibility these incidents are linked.
"This is another despicable incidence of people preying on the vulnerable.
"We need neighbours and friends to keep an eye on those who could be targeted.
"Again, we would point out that Yorkshire Water would never cold call at your home. They do not need to enter your property to check your supply. Always check identification and if you are unsure, call Yorkshire Water. If they persist, don’t be afraid to call 999."
Two of the men in Thursday’s incident were white. One was in his teens, the other in his 20s. The third may have been dark skinned or of East European appearance.
Anyone with information about the crime should call police on 0845 6060606 or Crimestoppers, anonymously, on 0800 555111.