A police warning has been issued after conmen pretending to be fixing a drainage problem targeted homes in a Rotherham street.
They were allowed into three homes in Salisbury Road, Maltby, and put a tablet down the toilets before leaving with contact details for the residents.
South Yorkshire Police said the men then contacted the residents and asked for a 'substantial sum of money'.
No cash was handed over and the incidents were reported to the police.
Sergeant Sharon Hulley, of South Yorkshire Police, said: “We’re grateful to the members of our community who have already reported concerns about this suspicious activity and I’d urge any other residents in Maltby or the surrounding areas to be mindful of anyone making similar claims.
“If you haven’t made an appointment with a tradesperson or a utility company to visit your home, don’t feel embarrassed to ask for their identity cards or a number you can call to check who they are.
“Close and lock the door behind you while you call the company they claim to be from to confirm who they are. This might sound a bit excessive, but these steps could protect you and your property.
“I’d also ask you to be mindful of any suspicious activity around vulnerable or elderly residents’ houses and report any concerns to police.”
Anyone with information about the incidents on Tuesday, July 12 should call South Yorkshire Police on 101.
Incidents can also be reported to Action Fraud on 0300 123 2040.