Driver's have called for guarantees over the safety of Pirelli tyres after Sebastian Vettel and Fernando Alonso suffered failures in Friday practice at Spa-Francorchamps.
The Belgian circuit is well known for being one of the hardest tracks of the year on tyres and after the blowouts suffered at the British Grand Prix some had aired concerns over possible failures at Spa.
Pirelli are sure the failures suffered by Alonso and more notably Vettel are not a recurrence of those seen at Silverstone, rather they were caused by debris on the circuit.
However, Pirelli has said it will send people out to investigate the track between Fagner and Paul Frere where the failures took place.
Speaking at Friday's briefing it is understood drivers brought up the subject of the tyres demanding the situation be 100% resolved. It is now thought the issue has been left with Pirelli and race director Charlie Whiting.
Pirelli's head of motorsport, Paul Hembery, admitted: "It is a worry for the sport because we have to go out and find what it is," he said."There is not a lot we can do, but we will try our very best to identify it to give us an indication of what is causing it."
Mark Webber, one of the heads at the GPDA (Grand Prix Drivers Association) said the driver's wanted a specific reason for the failures.
"We need answers and 'debris' is not the answer," said the Australian on the situation.
Speaking about what they hand found after investigating the tyres of both Vettel and Alonso, Hembery revealed: "It looks on the Red Bull as though something has been rubbing on the surface and then has just cut through the surface."
"On the Ferrari there are two quite clear holes through the top of the tread, so we have to go and look at the track later to go and see what is between Turns 13 and 15."
"We have seen a lot of signs on other tyres, small surface cuts, so there is clearly something. But I cannot tell you what it is - other than it is from external sources.
"[On the Red Bull] something has got caught up between the floor and the tyre."
One of the reasons for the high level of concern among the drivers is due to the high speed corners at Spa, due to the loads put through the tyres at high speed any failure could likely take place at a corner such as Eau Rouge or Blanchimont, both taken at nearly 190mph (312kph).
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