Police were called to Westminster Pier on the evening of Saturday, January 14 following reports of a large fight.
Officers were alerted to the incident at around 11.30pm and along with the London Ambulance Service , found three men suffering from assault related injuries.
The men were taken to a north London hospital for treatment.
Two of the men, a 24-year-old and a 21-year-old have since been arrested on suspicion of affray and have been taken to a central London police station for questioning.
The other, a 21-year-old man remains in hospital where he is receiving treatment for stab wounds.
The Met Police say his condition is not life threatening.
A third man, also aged 21, was arrested at the scene on suspicion of affray.
He remains in custody at a central London police station.
Enquiries into the incident continue as police in Westminster investigate.
Anyone with information relating to what happened is urged call police on 101, or get in touch by Tweeting @MetCC.
Alternatively, you can contact Crimestoppers Anonymously on 0800 555 111.
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