Damage to car tyres have been reported to Tavistock Police in Riverside Car Park Tavistock.
Large quantities of tacks have been scattered on the ground of the car park and caused punctures.
Anyone who has witnessed any suspicious activity between Sunday, March 10 and last Sunday (March 17) is asked to please call or e-mail 101 or use the independent Crimestoppers number 0800 555 111 quoting Occurrence 50240063470