Watch: Would-be thief target cars in Ribbleton while owners sleep
The video, posted on police's Facebook page, show a hooded figures trying car doors.
A force spokesman said: "A person has been seen on multiple CCTV cameras, trying car door handles and on one occasion actually managed to get into a vehicle and had a look through it, thankfully nothing was stolen.
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Hide Ad"If you see anything suspicious, please report this to 101 in a non-emergency or 999 on an emergency, alternatively you can use our 'Report Online' function on the Lancs Police website or anonymously via CrimeStoppers.
"Any information can be passed to the officer in case by emailing [email protected]."