Police have warned Market Harborough people to be on their guard after the return of distraction burglars to the town.
The thieves stole £700 from the home of an elderly lady after pretending to be checking water pressures.
The burglary happened to a single woman aged in her 70s who lives in Western Avenue in town.
It is the first distraction burglary in town for at least six months, police believe.
The two burglars were challenged by builders working nearby, but the thieves escaped in a blue Vauxhall driven by a third man.
Police say they have a good description of the two burglars but are appealing for more witnesses.
The incident happened last Thursday at about 2.45pm.
The burglars knocked on the rear door of the woman’s house and said they needed to check water pressures, due to building work taking place nearby.
“There was genuinely some building work going on at the rear of her property,” said PC Malc Roberts, of Market Harborough police.
While the woman was distracted, at least one of the men made his way upstairs.
The woman screamed when she realised what was happening, and the crooks ran out of the house.
“The genuine local builders heard the noise and briefly confronted the two males, but the two thieves walked off and escaped in a blue Vauxhall,” said PC Roberts.
“The builders are quite gutted that they didn’t know what was going on, and that they let the two men walk away,” he added.
Police said the victim was still really upset about what happened.
“This sort of crime has a big impact on the victim, and we always take it very seriously.”
Police reminded local pensioners to use door chains and not to let anyone in their home unless they have a valid ID.
If people suspect a bogus caller, phone 999.
Police would rather attend a false alarm than not catch a distraction burglar.