That is absolutely astonishing, and unbelievable that there were so serious injuries.
It reminds me of an article I watched last week regarding a crash at Le Mans many years ago, where a car was launched into the crowd by a set of freak circumstances, killing and maiming dozens in the crowd.
1955 Le Mans Disaster (Available on Iplayer until Wednesday night at the latest)
This weeks crash is either a wonderful testament to improvements in car and motor sports safety, or just a bloody lucky escape.