Bedfordshire Police has released a CCTV image of a man suspected of indecently touching a woman.
The victim was shopping in Bedford Square, Houghton Regis when she was followed by the man who indecently touched her.
The suspect is described as white, about 18 years old, slim build, 5ft 8ins tall with brown hair. He was wearing a distinctive light blue hoody.
Witnesses are being asked to contact PC Sam Shane at Luton CID on 01582 394064, or call the 24 hour non-emergency number 101.