Pirelli has revealed that Sebastian Vettel's tyre failure in the closing stages of the British Grand Prix was caused by a slow puncture, though it is yet to discover what caused Kimi Raikkonen's on the previous lap.
Both Ferrari's suffered dramatic failures to the front-left tyre in the closing laps of the Silverstone race. After the race Pirelli said the failures were unrelated -- Raikkonen's tyre remained had remained intact, while Vettel's was completely deflated and destroyed.
Formula One's tyre supplier launched an immediate investigation into both failures. While that process has provided answers for Vettel's failure it is still yet to understand the cause behind Raikkonen's.