Video: Paul Walker's fatal crash caught on CCT

CCTV footage that reveals the precise moment that Paul Walker's Porsche Carrera GT careered into a tree and burst into a flames has been released - as one witness claimed that the crash was an accident not a drag race.

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 written statement on Monday. 'No eyewitness has contacted the [department] to say there was a second vehicle.' 

The surveillance footage shot from a nearby rooftop camera and obtained by OMG! Insider shows a plume of black smoke billow into the sky in the seconds after the crash, just moments before what appears to be a large detonation sends a huge fireball skywards.

Meanwhile a friend of Paul and Roger Rodas who was at the charity show on Saturday said the two friends took the Porsche out to check for a suspected mechanical issue and not for a joyride as is being reported.

'As they were backing up the Carrera to put into the garage, it started stalling. I heard someone say, and I think it was Roger, "Why is the car stalling? Let’s take it around the block", the friend told Hollywood Reporter. 'Paul said, "Let me go with you really quickly. The whole premise of taking the car out for a drive was because something was wrong. These guys are business owners and Paul was a celebrity. They are responsible people. It was more like, "What the hell is wrong with this car? Let’s see what’s wrong and go for a drive".' (Find the CCTV footage after the cut)