Damage was caused to a shop front window at Galleria, High Street, Tenby, at approximately 4.30 pm on Tuesday.
"Images have been captured on CCTV and are being sent for enhancement," said a police spokesman.
"It may be that this is a case of accidental damage," added the spokesman, who appealed for the persons involved or any witnesses to contact PC1033 Boorman at the town's police station.