A teenage girl has been arrested on suspicion of assault in relation to an attack outside a nightclub in February.
Police have now released CCTV images of the attack to try to identify a woman.
The incident happened around 3.30am and 3.40am on February 20, when an 18-year-old girl was attacked by two other women in the car park of Batchwood Hall nightclub in St Albans.
The victim suffered extensive damage to her teeth, which required emergency surgery and severe bruising.
An earlier altercation had occurred between the victim and the women while they were in the coat queue inside the nightclub, which resulted in them being told to leave by door staff.
The woman has been released on police bail until July 18. Police would like to speak to the woman in the video, who they say could help with their investigations.
Anyone with information should contact Hertfordshire Constabulary on 101.
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