The motorsport world is mourning the tragic death of 19-year-old Moto3 rider Jason Dupasquier, who died in hospital after a horror crash in qualifying at the Italian Grand Prix.
The Swiss rider suffered severe injuries when he was hit by another bike after falling from his own on Saturday.
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Dupasquier was treated by medics at the circuit before he was airlifted to the Careggi Hospital in Florence, outside of Mugello.
MotoGP announced his tragic death on Sunday.
"Following a serious incident in the Moto3 qualifying two session at the Gran Premio d'Italia Oakley, it is with great sadness that we report the passing of Moto3 rider Jason Dupasquier," MotoGP said in a statement.
"Dupasquier was involved in a multi-rider incident between turns nine and 10, with the session red-flagged thereafter.
"The Swiss rider was attended to on track before being transferred by medical helicopter, in a stable state, to Careggi Hospital in Florence.
"Despite the best efforts of circuit medical staff and all those subsequently attending to the Swiss rider, the hospital has announced that Dupasquier has sadly succumbed to his injuries."
Formula One said in a statement of its own: "No words can ever describe the pain of such a loss".
"Our thoughts are with Jason's family, friends and the entire MotoGP community."
Motorsport world in shock over Jason Dupasquier tragedy
Australian MotoGP rider Jack Miller wrote "Rest in peace Jason" on social media.
"Thinking of his family and team," Miller said on Twitter.
Three-time MotoGP champion Jorge Lorenzo wrote: "My deepest condolences to Jason Dupasquier's family, friends and team."
British F1 driver George Russell, 23, posted: "Motorsport can be so cruel. Thinking of the family and friends of Jason Dupasquier and everyone in the MotoGP paddock. Ride in peace, Jason."
Ferrari's Charles Leclerc, who secured pole position at last weekend's Monaco Grand Prix, also paid tribute, tweeting: "Rest in peace, Jason."
Dupasquier's team, Prustel GP, did not take part in Sunday's race, while his fellow Swiss rider Tom Luthi pulled out of the Moto2 contest.
“It’s with the heaviest of hearts that we announce the passing of Jason Dupasquier," Prustel GP wrote on Facebook.
“We’re devastated, and at this time all of our thoughts are with Jason’s family.
“You’ll be sorely missed and never forgotten, Jason.”
The Swiss teenager was in his second season in MotoGP's lightweight class and was in the top 10 in the overall standings heading into the weekend.
The MotoGP grid staged a one-minute silence ahead of Sunday's 23-lap race, which was won by world championship leader Fabio Quartararo.
Following his victory, the French rider stopped at the scene of Dupasquier's accident before pointing to the sky.
He then waved a Swiss flag on the podium in Dupasquier's honour.
"It was tough because when you do the one-minute silence, the emotion is coming really quick and it is difficult to stay focused," said Quartararo following his third victory of the season.
"We got the win and that one was for Jason and his family."
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