Paul Walker
Flowers and movies left by fans are seen at the scene of the car crash where actor Paul Walker was killed in the Santa Clarita area of Los AngelesReuters

Autopsies on actor Paul Walker and Roger Rodas, who were both killed in a tragic car crash, have been completed but the results would be released only by Wednesday, according to officials investigating the accident.

The "Fast and Furious" actor, 40, died along with friend Rodas, 38, on Saturday after their car Porsche Carrera GT exploded in flames, seconds after slamming into a light pole and a tree in Santa Clarita, Los Angeles. Paul was believed to be in the passenger seat, with Rodas driving, when the accident took place.

Craig Harvey from the office of Los Angeles County Coroner told Los Angeles Times that the autopsis on the victims were completed but final identification process of the bodies would start only by Tuesday night.

"No results will be released until at the earliest, tomorrow (Wednesday)," Harvey informed LA Times in an email on Tuesday. 

The authorities had to obtain dental records of the victims from their families, as they could not identify them. The results of the autopsy will reveal who was behind the wheels when the tragic accident happened.

Several theories, including high speed, mechanical failure and drag racing, have been doing the rounds as the cause of the crash. However, authorities have maintained that speeding might have caused to accident.

Speculations that the victims might have been involved in a drag race does not hold water as eye witnesses and video footage obtained from a nearby surveillance camera have revealed there was no other car seen on the road when the Porsche Carrera GT hit a tree.

According to a report by TMZ, sources close to Always Evolving - the shop co-owned by Walker and Rodas - said that the fatal crash could have been a result of mechanical failure, citing evidence of a fluid burst and subsequent fluid trail before the skid marks at the accident scene. Moreover, Rodas was a pro race-car driver who took part in the Porsche Cup Cars series for many years, casting doubts if he actually lost control of the car.