Police are searching for two men who snatched a handbag from a car outside the Tesco Extra megastore in Hemel Hempstead.
A 999 call was made at 10.49am on Tuesday after the theft in the car park, believed to have occurred as a lady returned her trolley. They dropped the bag as they made off.
One suspect is described as white, in his 30s to 40s, with receding blonde hair. The Asian man was in his 20s to 30s and wearing dark clothing.
Call police on 101 with information.