A 28-year-old man has been charged with three counts of causing death by dangerous driving after a car crash which killed three teenagers.
Jaynesh Chudasama was arrested after the crash near a bus stop in Hayes, west London, on Friday evening.
A 34-year-old man is also being held on suspicion of causing death by dangerous driving after handing himself in.
Police have named the victims as Harry Rice, 17, and 16-year-olds George Wilkinson and Josh McGuinness.
Josh had previously been named locally, and on his Facebook profile, as Josh Kennedy.
A Met Police statement said Mr Chudasama, from Hayes, will appear in custody at Uxbridge Magistrates' Court on 29 January.
The boys were on their way to a 16th birthday party when the incident happened, close to the Esso garage near junction four of the M4.
The victims were with a group of friends walking towards the Goals five-a-side football club at about 20:40 GMT on Friday.
Det Sgt Michael Rapp, from the Met's serious collision investigation unit, said: "This is a fast-moving investigation and CCTV inquiries and forensic analysis of the car involved are under way."
Ch Supt Colin Wingrove, of Hillingdon Borough Police, said: "There is understandably a lot of shock and grief in the local community.
"I would like to reiterate the appeal from the families that their privacy is respected at this difficult time so they can grieve in peace."
Tash Moriarty, Harefield Academy head teacher, said: "We are all shocked and deeply saddened by the tragic loss of three students who attended the Harefield Academy.
"Our thoughts and condolences are with their families, friends and loved ones at this terrible time.
"We are offering help and support to all students and staff who have been affected by this incident, and ask everyone to respect their privacy at this difficult time."
George Wilkinson's grandfather, Nigel Goodhand, went to the scene on Sunday.
He said: "I'm really cut up. It hurts. George's mother has lost the plot.
"I wasn't going to stop here, but I had to in the end.
"He will be sorely missed."
One tribute left at the scene read: "George Boy, I love you so much, love Kev, Vinnie."
Another said: "I thought I would never have to write this and I don't know what to write but I will always love and miss you millions."
Elsewhere, a card read "To my bro, always together forever," while a fourth said: "To my darling baby boi my heart is broken, love mum, Vinnie."