Punches were thrown during a fight in a supermarket in St Albans.
Hertfordshire Constabulary says a teenage girl and woman were involved in a fight - with one punching the other - at the Morrisons store in Hatfield Road.
During the incident a glass bottle was also reportedly smashed.
No injuries were sustained, police said.
The incident happened around 6.30pm on Monday, November 15.
Police are now appealing for witnesses and information.
Detective Constable Stephanie May, who is investigating, said: “Enquiries into this incident are underway with those involved identified and CCTV being reviewed, however we would like to hear from anyone who witnessed the incident that has not yet been in touch with us.
“Anyone with information can contact me directly via email at stephanie.may@herts.police.uk”
You can also report information online at herts.police.uk/report or call the non-emergency number 101, quoting crime reference 41/89581/21.
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