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Vin Diesel pays tribute to Paul Walker

An emotional Vin Diesel speaks to fans at the site where his Fast and Furious co-star was killed.

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Paul Walker's Fast & Furious co-stars are struggling to cope with the death of their friend and colleague.

After attending a private memorial service Monday night in Santa Clarita, California, where Walker died in a car crash on Saturday, Vin Diesel, 46, went to the scene and made an impromptu speech in Valencia using a sheriff's car's microphone.

Paul Walker and Vin Diesael.

'Brothers' on and off screen ... Fast and Furious co-stars Paul Walker (Brian) and Vin Diesel (Dominic). Photo: Getty

Describing Walker as his "brother," Diesel thanked fans.

"At this hard time his family gets to see all of you show the love that you've shown Paul. It's going to stay with me forever," Diesel said.

"I just wanted to say thank you. Thank you for coming down here and showing that angel up in heaven how much you appreciate him."

Vin Diesel's tribute to co-star Paul Walker.

Vin Diesel's tribute to co-star Paul Walker on Facebook.

In an online tribute Diesel mentioned Walker's "profound impact" on him.

"I will always love you Brian, as the brother you were ... on and off screen," he wrote on Facebook.

On Sunday, a visibly distraught Tyrese Gibson, Walker's Fast & Furious co-star, was in tears when he visited the crash scene.

He posted a photo on Instagram of ashes and wreckage in his hand, writing: "I will keep your energy with me forever #AshesOfAnAngel fast family around the world we live you and we love you Paul is the heartbeat of this franchise and were gonna see to it that his energy and presence lives on forever #myhearthurtssobad."

Investigations ongoing, racing not suspected

Law enforcement officials do not believe the Porsche in which Paul Walker and a friend were riding had been racing another car.

Accident investigators ''have received eyewitness statements that the car involved was travelling alone at a high rate of speed,'' the Los Angeles County Sheriff's Department said in a statement on Monday.

''No eyewitness has contacted the (department) to say there was a second vehicle.''

Walker and his friend and fellow fast-car enthusiast Roger Rodas died on Saturday when Rodas' 2005 Porsche Carrera GT smashed into a light pole and tree, then exploded in flames. The posted limit was 45mph (72km/h).

The two had taken what was expected to be a brief drive away from a charity fundraiser and toy drive at Rodas' custom car shop in Valencia, northwest of Los Angeles. Walker's publicist said the action star was the passenger.

The crash happened on a street that forms a near two-kilometre loop amid industrial office parks. It is rimmed by hills and relatively isolated from traffic, especially on weekends when the businesses are closed.

''It's well-known out here that that's a hot spot for street racers,'' California Highway Patrol Sgt Rick Miler said.

Skid marks are a testament to past antics on the loop. The sheriff's department, which polices the neighbourhood, said Saturday's wreck was not the first speed-related crash there, but would not reveal specifics.

Meanwhile, investigators are consulting video from security cameras, talking to witnesses and analysing physical evidence such as on-board computer data from the Porsche.

A steady stream of fans has flocked to the crash site to leave flowers, candles and memorabilia from the action films.