The neighbourhood where 'Fast Furious' star Paul Walker died in a fiery crash is known to attract street racers, but 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.