A man is expected to appear in court charged over a car crash that killed three teenage boys.
Jaynesh Chudasama, of Hayes, west London, is accused of three counts of causing death by dangerous driving, the Metropolitan Police said.
The 28-year-old will appear at Uxbridge Magistrates' Court on Monday.
A 34-year-old man was arrested on suspicion of causing death by dangerous driving after handing himself in at a north London police station at around 7pm on Sunday.
Investigators had appealed for the whereabouts of the older man, believing there were at least two men in a black Audi that ploughed into three friends on Shepiston Lane in Hayes.
Police have also named the victims as Harry Louis Rice, 17, and 16-year-olds George Toby Wilkinson and Josh McGunniess.
Despite the efforts of paramedics, all three boys were pronounced dead at the scene.
It is understood they had been on their way to a birthday party at a nearby football club when they were killed.
The victims were with a group of friends walking towards the Goals five-a-side football club at around 8.40pm on Friday when they were hit.
The collision occurred close to the Esso garage near junction four of the M4.