Five people have been taken to hospital after being stabbed during a large fight in northwest London, police have said.
Four men and one woman, who are in their late teens or 20s, suffered stab injuries during the incident in Railway Approach, Harrow.
The Metropolitan Police said two of the men were in a serious but stable condition.
The other three victims are not thought to be in life-threatening or life-changing conditions.
Officers were called to the fight at about 4am on Monday, and cordons remain in place.
Harrow MPS said on Twitter: "We were called at 4am to a large fight in Railway Approach, Harrow.
"Five people (age late teens or 20s) taken to hospital with stab injuries. Conditions of two men and one woman are not life-changing or life-threatening. Two other men are in a serious but stable condition."
Five ambulance cars, a medic in a car, two advanced paramedics and two incident response officers were sent to the incident, a spokesperson for London Ambulance Service said.
An air ambulance was also dispatched to the scene.
A police investigation is under way, but no arrests have been made yet.
Anyone with information or any witnesses are urged to call 101, ref 1238/30aug, or to contact Crimestoppers.