BURGLARS are targeting caravan owners' homes when they go away for the weekend.
Police believe thieves are scouring the East Riding searching for people cleaning and packing caravans on their driveways.
Since January, 11 houses have been burgled after the occupants went away in their caravans.
Detective Inspector Joanne Roe, from the serious acquisitive crime team, said: "I have a strong suspicion homes have been specifically targeted to be burgled after the offender has toured around the East Riding looking for caravan owners.
"I believe they are making note of any that look like they are getting ready to go away.
"The majority of the burglaries have happened across a weekend, which is what led me to my theory. I believe homes with caravans parked outside their addresses are being watched in the days prior to them going on a trip."
Homes in Howden, Gilberdyke, Elloughton, Brough, Airmyn, Rawcliffe, Market Weighton, Kirk Ella and West Ella have all been targeted.
Police say thousands of pounds of jewellery, money and other items have been stolen from the addresses.
Letters have now been sent to homes across the county warning caravan owners.
DI Roe said: "With two more bank holiday weekends approaching, I want to arm people with this knowledge in order to protect themselves and their homes from being targeted."
In the latest case, money and jewellery was stolen from a house in Boothgate Drive, Howden, between Friday and Monday.
The householder had gone away in his caravan, which was usually parked in the driveway.
Anyone with information about the burglaries, or who sees anything suspicious, should call Humberside Police on 101.