Two-time Indianapolis 500 winner Dan Wheldon was tragically killed in a crash at Las Vegas Motor Speedway on Sunday, and reaction is pouring in from around the racing world.
Here are some of the comments we've collected so far:
Sam Schmidt, owner of Wheldon's No. 77 car:
"Dan Wheldon was a tremendous competitor, a great racer and an even better person. It was an honor to have him be a part of our team. All of us at Sam Schmidt Motorsports are deeply saddened by his passing. On behalf of everyone at Sam Schmidt Motorsports, our prayers go out to all of his family, especially his wife, Susie, and their two children."
Jeff Belskus, Indianapolis Motor Speedway president:
"We are incredibly saddened at the passing of Dan Wheldon. He was a great champion of the Indianapolis 500 and a wonderful ambassador for the race, the Indianapolis Motor Speedway and all of motorsports. Most importantly, he was a fantastic husband, father and man – a good friend to so many in this sport.
His memory will live forever at the Speedway, both through the magnitude of his accomplishments on the track and his magnetism off the track. Our deepest sympathies are extended to his entire family, team and fans."
Andretti Autosport, Wheldon's former team:
"It is with extreme sorrow that we have lost one of our champion drivers today. Dan was an Indy 500 Champion and an Indy Series Champion with Andretti Autosport – and one of our closest compeditors. Dan brought such enthusiasm and and passion to the sport not often seen in motorsports.
We will remember Dan's tremendous racing accomplishments with our team as well as his infectious personality. We would like to express our deepest sympathy to Dan's family, racing team and his friends today. Dan is one of IndyCar's greatest champions."
Danica Patrick, via Twitter:
"There are no words for today. Myself and so many others are devastated. I pray for suzi and the kids that god will give them strength."
NASCAR chairman Brian France:
"NASCAR offers its deepest sympathies and condolences to the family of Dan Wheldon, his teammates, and the entire IndyCar Series community for their tragic loss today. They will be in our thoughts and prayers during this very difficult time."
Tony Kanaan, via Twitter:
"No words to describe the pain. See you on the other side my dear friend. You will be missed."
Scott Dixon, via Twitter:
"My dearest friend Danny boy. Thank you for everything! Your an amazing driver and man. I will miss you so badly. Luv ya mate"
IndyCar Series champion Dario Franchitti, via Twitter:
"Rest in peace Danny boy, we'll miss you my friend. Everyone please keep the wheldon family in you thoughts and prayers."
Marco Andretti, via Twitter:
"I looked up to you both as a racing driver and a person/friend. You will be forever missed. RIP Dan Wheldon."
Dale Earnhardt Jr.:
"I had the pleasure of meeting Dan Wheldon at the National Guard Youth Challenge dinner about five years ago, and we crossed paths several times since then, mostly through our mutual partnership with the National Guard. His success as a racer speaks for itself, but I will remember him as a true professional who was friendly, respectful, and genuine. On behalf of everyone at JR Motorsports, I send condolences to Dan's family, team, and friends in the racing community."
Please feel free to add your own tributes to Dan below in the comments section.