Police in Bodmin are warning vehicle owners to be vigilant after at least six cars were broken into last night.
Valuables were taken from the vehicles parked in Green Lane and Halgavor View.
Police say the thieves managed to open the doors of the cars without causing damage to the vehicles.
Item taken included a mobile phone, an I-pod, compact discs plus cash.
A police spokesman said: “The thieves have targeted older vehicles and removed items that are easy to sell on quite quickly.
“We would ask car owners not to leave anything of value in the their vehicles, and to remain vigilant.’’
Anyone with information about the thefts should contact Bodmin police on 101, quoting crime reference BB/13/2076.