6:38 am
Former world heavyweight boxing champion Lennox Lewis initially thought news of the death of Paul Walker might have been a hoax.
But when he realised it was true, he paid tribute to the actor on Twitter.
Lewis wrote: "Very sad to hear about Paul Walker.
"I was hoping it was another Twitter hoax.
6:20 am
Film director Roland Emmerich has written on Twiter: "Extremely saddened to hear of Paul Walker's passing.
"RIP."
6:17 am
WWE wrestler turned film star Dwayne "The Rock" Johnson has paid tribute to Walker on Twitter.
He wrote: "All my strength, love & faith to the Walker family during this heartbreaking time.
"We find our strength.. in his light.
"Love you brother."
6:15 am
Raper Ludacris has paid tribute to Paul Walker on Instagram.
He wrote: "Your humble spirit was felt from the start, wherever you blessed your presence you always left a mark, we were like brothers & our birthdays are only 1 day apart, now.
"You will forever hold a place in all of our hearts@paulwalker legacy will live on forever. R.I.P."
6:07 am
Actress Denise Richards is the latest Hollywood big name to react to the death of Paul Walker aged 40.
Richards, the ex-wife of Charlie Sheen, wrote on Twitter: "Shocked over the news about Paul Walker..so sad.
"My heart goes out to his family & loved ones.
"He was a kind beautiful soul."
6:04 am
Basketball columnist Bill Simmons is gutted at the death of Paul Walker.
He wrote on Twitter: "I'm a Paul Walker fan and that's probably an understatement.
"So sorry to hear about his tragic car accident.
"Can't believe it."
5:58 am
Former New Kids on the Block frontman Jordan Knight said Walker's death was a reminder of how fragile life can be.
The Hangin' Tough hitmaker wrote on Twitter: "R.I.P.Paul Walker...we will miss you.
"May your passing remind us all how fragile life is."
5:54 am
Model and actor Tyson Beckford worked with Paul Walker on the 2005 action film Into The Blue.
Beckford wrote on Twitter: "RIP Paul Walker, loved working with you on "Into the Blue".
"I will miss you."
5:50 am
5:46 am
Actress and recording artist Ashley Tisdale has paid her respects to Paul Walker.
The 28-year-old wrote on Twitter: "So sad about Paul Walker.
"May he rest in peace and join the Angels above.
"A truly beautiful person in work and helping others."
5:42 am
Paul Walker was a strong supporter of a humanitarian charity called Reach Out Worldwide.
A statement on its Facebook page read: "It is with a truly heavy heart that we must confirm that Paul Walker passed away today in a tragic car accident while attending a charity event for Reach Out Worldwide.
"He was a passenger in a friend's car, in which both lost their lives.
"We appreciate your patience as we too are stunned and saddened beyond belief by this news.
"Thank you for keeping his family and friends in your prayers during this very difficult time.
"We will do our best to keep you apprised on where to send condolences."
5:37 am
Paul Walker's co-star Vin Diesel has posted a heart-felt message on Instagram beneath a photo of the two of them.
It reads simply: "Brother I will miss you very much.
"I am absolutely speechless.
"Heaven has gained a new Angel.
"Rest in Peace."
5:31 am
Benjamin Wallfisch, an Emmy-nominated composer who has worked on films including Atonement and V For Vendetta, has paid tribute to Paul Walker.
He wrote on Twitter: "Such incredibly sad news.
"Paul Walker was a truly wonderful, generous and deeply talented man.
"My thoughts are with his family."
5:27 am
A statement issued by Santa Clarita police in the wake of Paul Walker's death read as follows:
"When they arrived, deputies found the vehicle engulfed in flames.
"The Los Angeles County Fire Department responded, extinguished the fire and subsequently located two victims inside the vehicle.
"The victims were pronounced dead at the scene."
5:23 am
Mixed martial artist Anderson Silva, a former UFC middleweight champion, has spoken of his shock at the death of Paul Walker.
Brazilian Silva told his 4.1 million followers on Twitter: "I was a big fan of Paul Walker.
"I would like to send my most heartfelt prayers to his family."
5:19 am
Universal Studios, the company behind the Fast and Furious films, has released a statement following the death of Paul Walker in a car crash.
It read: "All of us at Universal are heartbroken.
"Paul was truly one of the most beloved and respected members of our studio family for 14 years, and this loss is devastating to us, to everyone involved with the 'Fast and Furious' films and to countless fans.
"We send our deepest and most sincere condolences to Paul's family."
5:16 am
Model, actress, socialite and recording artist Amber Rose has also used Twitter to express her disbelief at the death of Paul Walker in a car crash.
Rose, the wife of rapper Wiz Khalifa, tweeted: "I can't believe Paul Walker died (Tears) Thats so sad! God Bless him and his Family. RIPPaulWalker :-(
5:12 am
Paul Walker's last tweet was as recent as yesterday.
He wrote a message on Twitter asking fans of the Fast and Furious films whether they would be ready for his return alongside Vin Diesel in Fast and Furious 7, due for release next year.
Here is the tweet below, complete with a photo of Walker and Diesel in character...
5:06 am
Antonio Holmes, who says he was a friend of Paul Walker, was at the scene of the accident and saw the Porsche burst into flames.
He told the Santa Clarita Valley Signal newspaper that he had tried to put the fire out and recognized Walker inside the vehicle.
Holmes said: "Him and his buddy, his brother in arms at heart just decided to joyride, take a spin.
"Something we all do.
"We're all car enthusiasts. ... We’re all here driving, enjoying each other, and God must’ve needed help.
"We all heard from our location (the accident).
"It's a little difficult to know what it was. Someone called it in and said it was a vehicle fire.
"We all ran around and jumped in cars and grabbed fire extinguishers and immediately went to the vehicle.
"It was engulfed in flames.
"There was nothing.
"They were trapped.
"Employees, friends of the shop. We tried. We tried. We went through fire extinguishers."
5:02 am
Actor Austin Nichols has also paid tribute to Paul Walker.
Nichols, the star of films including The Day After Tomorrow and Wimbledon, wrote on Twitter: "I met Paul Walker at one of my first auditions.
"I was 18 and wide eyed.
"He stood there and answered my naive questions for 15 minutes.
"A very kind man. Paul Walker."
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