Formula One drivers have threatened to boycott Sunday night's German Grand Prix if there is a repeat of the tyre failures experienced at Silverstone last weekend.
The Grand Prix Drivers' Association, which represents the vast majority of drivers, issued a statement at the Nurburgring today saying the drivers wanted to express their "deepest concerns".
The GPDA added: "If similar problems manifest themselves at the German GP, they shall immediately withdraw."
Six drivers suffered failures during the British Grand Prix - Mercedes' Lewis Hamilton, Ferrari drivers Felipe Massa and Fernando Alonso, Toro Rosso's Jean-Eric Vergne, Sauber's Esteban Gutierrez and McLaren's Sergio Perez.
Tyre supplier Pirelli has produced a tyre of a different design for this weekend's race in an attempt to solve the problem.