Three men have been arrested over a string of alleged cons by door-to-door traders in part of Leeds.
A number of residents of the Linton Road area of Alwoodley have reportedly been targeted by a gang charging sky-high rates for cheap roofing work.
The men, aged 21, 24 and 44, were arrested on suspicion of fraud before being released on police bail pending further enquiries.
Police are now warning people to be on their guard.
Det Sgt Chris Craven, of the Leeds neighbourhood crime team, said: “I would urge people to always be wary of callers who turn up on their doorstep offering to do work.
“People should only have work done at their homes by established reputable firms that have the recommendation of someone they know who has had work done by them. If they have any doubts about a firm they should check them out with local trading standards. The safest way is not to do business with anyone who calls at your home unexpectedly.
“I would also encourage people to keep an eye out for elderly and vulnerable neighbours and contact the police if they are suspicious about anyone calling at homes in their street.”