BURGLARIES have surged in the last three months.
And police say it is because warnings about leaving doors and windows open during fine weather have been ignored.
More than one in four of the burglaries have been sneak-ins, where a passing thief has spotted an opportunity.
Det Insp John Minary, of West Yorkshire Police's Community Safety Unit, said: "Despite campaigns by local police, a number of householders are failing to heed our advice and are leaving themselves open to crime."
During the last three months there have been 1,130 sneak-in burglaries, of which 274 have been at the homes of elderly victims.
The thieves have mainly struck in the afternoon and early evening taking items including cash, cards, bags and jewellery.
Thousands of crime prevention leaflets have been issued by the Force's Community Safety Department.
* Further advice is available from the West Yorkshire Police website at www.westyorkshire. police.uk or by contacting the Crime Reduction Officer on 0845 6060606.