F1 title winner Sebastian Vettel admits that the past two weeks have been 'horrible' for motorsport fans following the fatal accidents suffered by Dan Wheldon and Marco Simoncelli.

Just hours after Vettel's victory in the Korean Grand Prix helped Red Bull to wrap up the constructors' championship, Wheldon lost his life in the final round of the IndyCar Series season in Las Vegas.

Then, just a week later, Simoncelli died in the Malaysian MotoGP event at Sepang after falling from his bike and being hit by Colin Edwards and Valentino Rossi.

"It has been a horrible last two weeks for motorsport," Vettel was quoted by ESPN. "The moment I came back from Korea I heard about the accident of Dan Wheldon in America. Then, last week I sat on my sofa to watch the MotoGP and saw the crash of Marco. I wasn't a very close friend but I knew him and I met him this year."

Despite the deaths of two of the biggest names in the sport, Vettel added that risk was part of motor racing despite the continued drive to improve safety for those competing on track.

"We all take a certain risk when we jump into the car or go onto the bike." he said. "We love motorsport, we love the thrill and at the same time we always hope that nothing will happen. We love what we do and we are happy to take those certain risks but it is really shocking to see how quickly things can change.

"I think we should always try to make things safer, sometimes we will get criticised for the cars being too far away, the run-offs being too big and so on but on the other hand we never want to put ourselves in the situation like all the MotoGP riders are going through now or the IndyCar series is going through now. So we will keep the fingers crossed and hope nothing will happen but it's not impossible and we know that. At the moment the only thing we can do is respect and give the families enough space and enough room and the time they need."