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Pirelli motorsport director Paul Hembery said the tyre blow-outs in the British Grand Prix were a previously unseen issue.

But he declined to be drawn on the nature of the problems until a full analysis was complete.

Lewis Hamilton, Felipe Massa, Jean-Eric Vergne and Sergio Perez all saw their left rear tyres blow in dramatic fashion during the Silverstone race.

"Obviously today wasn't foreseen," said Hembery.

"We've seen something new, a different type of problem.

"We're currently performing our analysis. We've got to go away and understand what's happened today.

"When we've got the facts we can understand what's happened and get to the core of the issues.

"We take these things seriously and when we have the answers I'll let you know.

"It's pointless me adding anything else until we have all the facts."

Hamilton and Perez both described the tyre problems as "unacceptable" after the race.