Officers are appealing for information and witnesses following an alleged physical altercation at The Forum in Hatfield.
The incident happened between 1.30am and 2am on Thursday 18 January.
It is reported that several males were involved, with two losing consciousness and another sustaining a cut lip.
A 17 year old boy was arrested today (Tuesday 30 January) on suspicion of GBH. He remains in custody at this time.
Detective Sergeant Kayleigh Simm, from the Welwyn Hatfield Local Crime Unit, said: “The victims are being supported and we are appealing for information and witnesses to come forward. If you saw what happened or have other information that could help, please let us know.
“You can get in touch by emailing me at [email protected] quoting crime reference 41/6592/23.
“We are also aware that video footage of the incident was shared on social media and I would like to remind the public that sharing such footage could jeopardise court proceedings under the Contempt of Court Act. We have already been in contact with those found to be posting footage online.”
You can report information online, speak to an operator in our Force Communications Room via our online web chat at herts.police.uk/contact or call the non-emergency number 101.