Southwark Police are investigating a racial assault which took place in Borough High Street in the early hours of Thursday 12 February.
It then continued along the road and ended near the junction with Great Dover Street with a 22-year-old Asian man being stabbed.
The victim and his friends walked the short distance to Southwark Police Station where officers found them and called an ambulance. The 22-year-old man was taken to a local hospital and treated for stab wounds to his chest and buttocks.
At around 2.30 am a police patrol stopped a large group of white men in Walworth Road who answered the description that had been circulated.
They were arrested in connection with the assault and taken to a local police station for questioning. CS spray was deployed during the arrests.
Police dogs later discovered a knife in the area. It will be forensically tested.
The suspects are 11 white men in their 20s.
The victim and his three companions are Asian, also in their 20s.
Police believe the victim's injuries to be non-life threatening. His companions did not require hospital treatment although they had also been punched.
The assault and stabbing, which took place near the premises of the Commission for Racial Equality, is being investigated by Southwark Community Safety Unit.
• Anyone who was in the Borough High Street around 2am on Thursday 12 February, and may have seen anything of the altercation or the assault, should contact officers on 020 7232 2327 or Crimestoppers on 0800 555 111 if you wish to remain anonymous.