Pirelli believes Ferrari suffered two different tire failures on its cars in the closing stages of the British Grand Prix, following initial investigations.

Kimi Raikkonen was running in second place when he suffered a left-front tire failure, with damage visible in the middle of the tire. While Raikkonen got back to the pits without his tire deflating, teammate Sebastian Vettel went off at Woodcote just one lap later, also with a left-front problem, and his tire delaminated as he returned to the pits.

Pirelli racing manager Mario Isola says investigations have already started into the two failures but that the state of each tire when it returned to the pits suggests different problems.

“We are obviously investigating the tire as usual but more deeply because of what happened,” Isola said. “We believe – although it has to be proven – that the mode of failure of the two tires is different, so we need to investigate.

“What we can exclude is that we had any carcass failure on Kimi’s tire because the tire was still inflated. There is a part of the tire that is damaged and we will investigate deeply on all the tires, not just this tire.

“Sebastian had a different issue with a loss of air, so we have to understand and we will provide a report. We are working together with the teams, because the data from the teams is an important part of the investigation and it’s in the interest of everybody to better understand what happened.

“We will see that from the data, because on the data you have a lot of information and numbers that will give you something more. But my colleagues are currently analyzing with the Ferrari guys and we will work to find an explanation as soon as possible because it is interesting to have something very soon.”

Asked if Pirelli had noted any similar problems on any other cars, Isola replied: “No, but we will investigate the tires from other cars, especially the quick ones to have a comparison.

“We don’t have any other evidence of an issue.”

Isola revealed that teams are not given limits or advice on how many laps each tire can do, but is certain this year’s Pirellis are strong enough for high-speed circuits such as Silverstone.

“No [we don’t give advice], we give them the data we collect on Friday. So on a Friday we measure the wear and they have the numbers so they know what they can do. But I’m not saying it was a problem of wear, so we need to understand before that.

“We are not giving a limit this year because we have different cars that are wearing the tires in a different way. So we are just giving them the numbers. We cannot say now that it is a problem of wear and it’s not a problem of fatigue, so it’s not a problem of integrity.”