Five young men have suffered multiple stab wounds in an apparent knife fight.
The men - all believed to be in their late teens and early 20s - were found in the early hours of Monday near the O2 Arena, in Greenwich, south-east London.
Their conditions were not believed to life-threatening, a Scotland Yard spokesman said.
Police are yet to make any arrests in connection with the attacks.
Officers were initially told of one man being stabbed near North Greenwich bus station at 2am, a Scotland Yard spokesman said.
He added: "Officers and London Ambulance Service attended and on arrival found the victim, aged late teens/early 20s, suffering stab wounds.
"Four other victims, all male, aged late teens/early 20s, were also suffering stab wounds.
"Three were taken to an east London hospital, the other two to a south London hospital.
"Inquiries into the circumstances of the incident are ongoing. There have been no arrests at this time."