Three teenage boys have died after a car ploughed into a bus stop in west London in an incident that police are not treating as terror-related.
Emergency services were called to Shepiston Lane in Hayes, near Junction 4 on the M4, at 8.41pm on Friday following reports of a serious traffic accident.
Paramedics tried to save the boys, who were said to all be around 16 years old, but all three were pronounced dead at the scene.
The victims have yet to be formally identified, but all of the next of kin of the deceased have been informed, the Met Police said.
The three victims of the crash have been named locally and in floral tributes as George, Josh and Harry. Messages left on the tributes suggest the boys were on their way to a party when the tragedy happened.
A 28-year-old man who was inside the vehicle, a black Audi, has been arrested and was taken to a west London hospital for treatment.
Other teenagers standing with the group at the bus stop, which is close to an Esso petrol station, were unharmed in the crash.
Investigators have said they are still trying to establish the sequence of events that led up to the collision, and whether there were any other occupants in the vehicle.
It is believed the Audi mounted the pavement near the garage a few yards down the road before the collision.
The road was closed while the incident was investigated, but the closure has since been lifted.
Officers from the Met's Road and Transport Policing command have urged anyone who may have witnessed the crash to come forward.
Detective Jane Shaw, of the Serious Collision Investigation Unit, said: "These are horrific circumstances that have resulted in three young people losing their lives; I need anyone who saw what happened to contact police immediately.
"Did you see this Audi before the collision, or in the moments leading it up to it? I would urge you to speak to us to assist us with our investigation."