"Horrible scenes on the descent as Porte and Martin crash hard".
He lay motionless on the road for some time, being attended to by medics before being taken to hospital, although organisers said he was conscious and speaking.
On descent of Mont du Chat, the final hors categorie, Porte crashed and skidded across the road and into the side of the mountain wall, with Daniel Martin (Quickstep) unable to avoid crashing into him.
But once the result of the photo finish came in, Barguil had another reason to cry: Uran was adjudged to have won by a whisker, and instead it was the 30-year-old Colombian who was left to celebrate a first Tour stage win of his career.
Uran got the verdict in a photo finish to what was an action-packed Sunday, denying Warren Barguil a stage win in his homeland by the narrowest of margins in Chambery.
Twice former victor Alberto Contador was one of the big losers on the day from the 181.5km stage from Nantua to Chambéry.
Thomas had crashed on another descent, made treacherous by rain, earlier in the day, suffering a suspected broken collarbone.
"I want to thank the other riders, who did not attack", he added, saying he did not see Aru attacking past him as he raised his arms to ask for assistance.
Overall, Froome leads Fabio Aru of Italy by 18 seconds and Romain Bardet of France by 51 seconds.
Martin lost more than a minute, as did Movistar's Nairo Quintana, three times a runner-up in the race, while former victor Alberto Contador of Trek Segafredo seems to be out of contention after losing over four minutes.