Thames Valley Police is releasing an image of a person officers would like to speak to in connection with an assault in Chesham.
At around 6.40pm on Monday 11 March, an offender entered Premier Express on Bellingdon Road and racially abused staff and assaulted a woman.
The victim received a laceration to the back of her head. She attended hospital, but has since been discharged.
Investigating officer PC Jake Janes said: “We are releasing CCTV images of an individual we believe may have vital information in connection with this incident.
“We would ask anyone who recognises this individual to please get in touch through our online form or by contacting 101 quoting reference 43240114421.
“If you do not wish to speak to the police but have information you can contact Crimestoppers on 0800 555 111 and they will take you information anonymously.”