The FIA have announced they are widening their investigation into the secret Pirelli tyre tests, including Ferrari's test earlier in the year with a 2011 car.
At the Monaco Grand Prix, Red Bull and Ferrari lodged protests against Mercedes after it was revealed the Anglo-German team conducted a 1000km test at the Circuit de Catalunya with their 2013 car with Pirelli after the Spanish GP.
The rules state that Pirelli are allowed to ask permission from the FIA to conduct a test to try new tyres on safety grounds however, the FIA have said that Pirelli didn't follow the correct protocols to allow the test as, in their opinion, not all the teams were contacted about a possible test.
An email from FOTA (Formula One Teams Association) was then discovered warning all teams before this year that conducted any such test would be illegal.
Ferrari insists their test with Pirelli was legal because they used a 2011 specification car however the FIA has now included that test into their investigation.
In a statement the FIA said it had asked Mercedes and Ferrari: "To reply to a disciplinary inquiry in pursuance of the FIA judicial and disciplinary rules."
The FIA have also asked Pirelli to produce a dossier about the secret tests ahead of an international tribunal court hearing.
Mercedes have also claimed they did not learn anything from the test nor did they test the new compound tyres set to be introduced at Silverstone. Team boss Ross Brawn said Pirelli only supplied codes for the new tyres and "we couldn't get any usable information," he said.
Further information is coming out in regards to the Mercedes test however Mercedes motorsport Chairman Niki Lauda hit back at Red Bull claiming the only reason for their anger is because Mercedes accepted the invite the three-day test first.
Asked by Osterreich newspaper if he understands Dr Helmut Marko's anger, Lauda answered: "Of course.
"We took the opportunity to test, and I believe Red Bull was quite simply too slow to react. So I would also be annoyed.
"After the protest, the tribunal will decide whether the sporting regulations or the rules that Pirelli has negotiated with the FIA should stand over this.
"We have acted properly, and now an independent tribunal will decide," added Lauda.
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