Thieves have stolen tools from 11 different vans in the Bath area in the last two weeks.
There have been incidents in Odd Down and Twerton in Bath, and in Paulton, Peasedown St John, Keynsham and Radstock.
Most of the offences have happened at night, but some have been committed during the day.
Police are advising van drivers to take what they call sensible crime prevention steps, removing all valuable items from vehicles overnight, and always ensuring that they are locked and the windows secure.
Anyone with information about the thefts or who sees anyone suspicious around vans and building sites, such as people posing as workmen or drivers, is asked to call Bath police on 101.
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