A man who was cycling along the riverside has described how he heard 'arguing and shouting' shortly before two men were stabbed near to Norwich railway station.
Detectives are continuing to investigate after two men suffered knife wounds after being attacked in Riverside Road shortly before 3.20pm on Wednesday.
A 16-year-old girl remains in custody after being arrested on suspicion of assault following the incident which resulted in two men being taken to the Norfolk and Norwich Hospital for treatment.
Witnesses described their shock after the streets were left splattered with blood following the attack.
Police have since revealed that the incident started in Hollywood Bowl on Riverside before ending up close to the railway station.
Glenn Hales, 58, from Mile Cross, who was cycling along the riverside on Wednesday afternoon, has told how he heard 'some arguing' coming from near Hollywood Bowl on Riverside as passed through the area.
Mr Hales said he did not hear exactly what was said but insisted 'they were arguing and shouting'.
It is thought those involved in the melee then left the area by the river before ending up close to the Pizza Oro takeaway on Thorpe Road where the stabbings occurred.
Det Insp Chris Burgess, from Norwich CID, is leading the investigation and urged witnesses to come forward.
He said: 'We believe the altercation started in Hollywood Bowl on Riverside prior to the disturbance at the railway station.
'I'm keen to hear from anyone who may have witnessed people involved in a dispute walking towards the railway station around 3pm on Wednesday afternoon.'
Norwich policing commander Supt Terry Lordan said: 'This incident took place in a busy area of the city mid-afternoon and I know has caused concern among people who live, work and visit Norwich.
'I'd like to reassure you we have a team of detectives working on this case who are doing everything in their power to trace those responsible.
'We received a number of 999 calls from members of the public who witnessed the incident and officers were on scene within six-minutes of the first call being made.'
Information to police on 101 or contact Crimestoppers anonymously on 0800 555 111.
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