WATCH: Motorcyclists lucky to escape unharmed after terrifying fireball at Moto2 race

It's amazing that everyone was able to walk away from this.

A motorbike exploded during a Moto2 race in Aragon, Spain on Sunday, launching a huge fireball across the track. Commentators suggested an exploding fuel tank was to blame for the incident, after Spanish rider Xavi Cardelus fell off his bike and the momentum sent it sliding back across in front of other riders. There was an eerie delay as the first few riders avoided the fuel tank, which appeared to detach from Cardelus' bike as he fell from the vehicle. It was only a few seconds later that it burst into flames, seemingly after being clipped by one of the riders towards the back of the field. https://twitter.com/FranCalatayud19/status/736917459953934336 According to reports, all the drivers involved were able to walk away from the scene unscathed. It is testament to the skill of those involved that they managed to avoid catastrophe while travelling at such high speeds - the reactions of those watching live show just how serious it seemed at the time. https://twitter.com/djmattyg007/status/736912875474685952 South Africa's Steven Odendaal won both of the day's races at MotorLand Aragon, near the town of Alcañiz. Those drivers unable to avoid driving through the fireball were treated at the scene, but no serious injuries have been reported. https://www.instagram.com/p/BF_70eaD7bI/