Four people were treated by paramedics following a serious incident on the Yeading Lane Estate in Northolt on Monday evening.
The London Ambulance Service was called at 7.24pm on 24 August to reports of a stabbing.
A large emergency response was sent to the scene, including ambulance crews, incident response officers, crews from the Tactical Response Unit and an advanced paramedic in a fast-response car.
A trauma team from London’s Air Ambulance was also dispatched by both car and helicopter.
The ambulance service said four patients were treated at the scene.
Two were taken to a major trauma centre, while two others were treated for minor injuries and discharged at the scene.
Residents reported seeing a significant number of police and ambulance vehicles in the area, with the air ambulance landing nearby.
Local reports have described the incident as involving multiple stab injuries, although the ambulance service has not confirmed how many of the four patients were stabbed.
Further details are expected from the Metropolitan Police as enquiries continue.
This is a developing incident.
