Toro Rosso says it is investigating an issue with is rear suspension which led to both Daniil Kvyat and Carlos Sainz Jr. retiring from the European Grand Prix.
Kvyat started from sixth place but retired early on while Sainz Jr., who started in 18th spot, lasted longer before he was affected by a similar issue.
Toro Rosso believes stuck dampers impeded the normal movement of the suspension but the team is still investigating the issue.
"The car became difficult to handle at the beginning of the race and even though we had quite a decent first lap, in the end we had to stop – it’s a real pity, but that’s life, this is part of racing," said Kvyat.
"We need to investigate what happened and understand the issue, but we will definitely keep on pushing and fighting."
"It’s been a bit of a difficult weekend overall, and even though we were doing a good recovery in today’s race, unfortunately a suspension issue ended my race," added Sainz Jr.
"It’s a shame, because I had positive feelings in the car and our strategy and pace was looking decent."