Thieves have been targeting homes and cars in a spate of break-ins in Belper in the last month.
There have been 28 thefts from sheds, garages and vehicles during May.
It has prompted officers from Amber Valley Safer Neighbourhood teams to urge people to lock up their valuables.
Sgt Richard Booth said: “Due to the number of recent thefts, specifically of power tools, we would like to remind residents of the importance of securing their vehicles, sheds, garages and out buildings.
“It is essential that items of value are removed from vehicles and not left on display. Also, residents should ensure that a heavy-duty lock is used on sheds, garages and out buildings to deter would-be thieves.”
Officers handed out ‘don’t bother’ kits to residents, specifically targeting trades people with work vans.
Officers have also been marking property of high value such as power tools with a special UV pen.
l A garden shed on Edensor Drive, in Belper, was destroyed by fire at 5.30pm on Sunday. The fire spread to ten metres of garden fence.
Crews from Alfreton and Belper fought the flames for 30 minutes with a hose reel jet.