Items were stolen from two unlocked cars in Fen Road, Dowsby on Wednesday night.
A spate of thefts from cars in the Bourne area has caused police to launch a dedicated operation with increased patrols to try and fight the problem.
Police are also warning drivers in the area to take preventative measures to reduce the risk of becoming a victim of crime.
Police spokesman James Newall said: “We have seen a significant increase in thefts from cars in recent weeks. It does tend to spike at this time of year.
“Hotspot areas have been highlighted and patrols have been increased not only to detect crime but to prevent it.”
However, police have warned that motorists need to take precautions to avoid becoming a victim of crime, including locking your vehicle.
The cars being targeted are those with property left on display. Things like sat navs, smart phones, laptops and cash are being taken.
Police have warned that putting valuable items in a glove compartment is not good enough and said thieves will smash windows and search glove compartments.
Mr Newall said: “It takes criminals less than a minute to break into a car and steal something.”
They advise drivers to remove all items from vehicles when they are left unattended.
To report any information concerning any of these break ins call police on 101.