Cash and jewellery were stolen from two town centre shops raided by thieves.
Krishan’s Jewellers on Market Place, Chorley, and the Card Collection, on Chapel Street, were both hit by thieves on Sunday.
In the first incident, they drilled through roof of the jewellers to get into the shop and steal goods expected to reach thousands of pounds.
Police have now appealed for anyone with information to get in touch as they scour CCTV to catch those responsible.
The two incidents are being treated as connected.
Sgt Kevin Mountain, of Chorley Police, said: “We are appealing for anyone who might have seen someone in the town centre acting suspiciously on Sunday. We are looking at some CCTV and we believe there were two offenders involved.
“We are asking if people have seen people climbing up onto roofs or going down back alleyways in the town centre at this time.”
The incidents happened within around 15 minutes of each other.
Police say at around 7.10pm raiders gained entry to a flat above Krishan’s Jewellers and made a hole through the floor into the shop below.
A full list of the jewellery taken in the raid is still being compiled, but it is understood to run into thousands of pounds.
The thieves ran off when alarms sounded.
Five minutes later, at around 7.15pm, thieves smashed through the exterior wall leading to the Card Collection and went downstairs to the shop where they emptied the tills of £40 in cash.
Bosses at both businesses were unavailable for comment at the time of going to press.
Anyone with information is asked to contact police on 101.
Alternatively, contact Crimestoppers on 0800 555 111.