Three men have been rushed to hospital with knife wounds following a violent confrontation at a railway station.
British Transport Police described the Friday 6 February brawl as "an incredibly serious incident".
A pair of 20-year-olds sustained stab wounds while a 22-year-old suffered facial slash injuries during the violence at Egham railway station in Surrey. An 18-year-old was also attacked.
Royal Holloway University of London confirmed three of the victims are students at the institution.
Emergency services including BTP, paramedics and Surrey Police rushed to the location after receiving reports around 9pm of four people suffering knife injuries.
Authorities confirmed none of the wounded are facing life-threatening or life-changing conditions.
Officers have detained a suspect believed to be in his 30s who remains in custody.
The force believes the violence erupted between two separate groups previously unknown to one another and represents an "isolated" incident.
At least two additional individuals are thought to have escaped from the location.
BTP Detective Superintendent David Udomhiaye said: "We're aware of concerns from the local community and, while this is of course an incredibly serious incident, I can confirm that thankfully no one has been fatally injured.
"This is being treated as an isolated incident at the station involving two groups of people who we believe were not known to each other."
Saturday morning saw a police cordon established around the scene as officers continued their inquiry.
Mr Udomhiaye confirmed enhanced police visibility in the vicinity over upcoming days and appealed for witnesses to contact authorities.
He added: "There will be witnesses who have yet to speak to us, and I'd urge anyone in the area who might have dash or doorbell camera footage to make contact as quickly as possible."
A Royal Holloway University spokesman said: "We are aware of an incident at Egham train station last night in which three of our students were injured.
"Police have arrested a suspect and have confirmed there is no ongoing threat.
"Our teams supported the students involved last night and will continue to offer help.
"Out of respect for those involved and the ongoing investigation, it would be inappropriate to comment further at this time.
"Our Wellbeing teams are available to support any students should they have concerns, and we would urge people to follow Surrey Police and British Transport Police channels for further updates, as opposed to relying on unverified sources."
Anyone with information that could help police should text BTP on 61016, or call 0800 40 50 40, using the reference 682 of February 6. They can also anonymously contact Crimestoppers on 0800 555 111.
