McLaren team principal Eric Boullier has accused Red Bull of using coded radio messages to help Daniel Ricciardo in Sunday's Singapore Grand Prix.
A complicated week in the build-up to the race for the FIA saw them initially issue a detailed list of messages that would be prohibited from the race in Singapore onwards.
Motor sport's world governing body, however, backtracked on several of the guidelines following complaints from teams.
During the race at the Marina Bay Street Circuit, and with Daniel Ricciardo encountering problems with the battery in his car, at one stage he was told: "Avoiding exit kerbs may help the problem with the car."
Boullier feels such a message contravened the new regulations as he said: "We had no issues (with the new radio rules) on our side.
"It just made us more busy listening to others to make sure they made no mistakes, like Red Bull twice with Ricciardo.
"I think it was coded, but it is up to the FIA to investigate. It is not for me to investigate.
"But it was a strange message. Once was okay, but twice, three times? You can doubt what exactly the car problem was."
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Formula One team Mercedes has disciplined Nico Rosberg for crashing into team-mate Lewis Hamilton during last weekend's Belgian Grand Prix, warning the German driver that "another such incident will not be tolerated."
The team said Rosberg has "acknowledged his responsibility for the contact" that occurred in the second lap of Sunday's race and "apologized for this error of judgment."
Mercedes says "suitable disciplinary measures have been taken" against Rosberg but that he is free to race in the championship.
Rosberg leads the drivers' standings on 220 points, with Hamilton in second place on 191.
Mercedes says the two drivers "accept the team's No. 1 rule: there must be no contact between the team's cars on track."
The £60 million settlement in Bernie Ecclestone's bribery trial may seem a lot of money, but it leaves the road clear for one of sport's biggest operators to carry on exerting control over the world of Formula 1.
ITV News Sports Editor Steve Scott reports:
Formula One boss Bernie Ecclestone has to pay $100 million (£60m) as a settlement payment in his bribery trial, a Munich district court said.
A spokesman for the court said the suspicion against the 83-year-old was largely not substantiated.
The bribery trial against Formula One boss Bernie Ecclestone will be discontinued for the moment, a Munich district court said.
The announcement comes after the 83-year-old offered to pay a £60 million settlement to end the trial.
Bernie Ecclestone's defence lawyer has said it is "do-able" for the Formula 1 tycoon to pay out £60m within a week.
A district court in Munich said Mr Ecclestone, 83, had offered to pay the cash to end a trial for bribery.
The state prosecutor told the court that Mr Ecclestone's age and other circumstances meant they would support the offered settlement.
The billionaire could face up to 10 years in jail and have to give up control of his business if he is found guilty.
A spokeswoman for the Munich court pointed out that under German law settling the case with a payout did not amount to an admission of guilt.
"With this type of ending a procedure there is no ruling on guilt or innocence of the defendant," she said.
"He is neither acquitted nor judged, rather this is a special type of ending a procedure which is in theory available to all types of cases."
Formula One boss Bernie Ecclestone has offered to make a $100 million (£60m) payment in order to end a trial on bribery charges, a court in Germany heard.
State prosecutors in Munich said they would agree to accept the offer, according to Reuters.
The 83-year-old went on trial in April over allegations he bribed a former German banker as part of the sale of a major stake in the motorsport business eight years ago.
Ecclestone's age and other circumstances supported the acceptance of a settlement, the state prosecutor said.
The British billionaire could have faced up to 10 years in jail and would have had to cede control of a business he has built up over the past four decades.
A Formula One Grand Prix on the streets of London may have moved a step closer after the Government announced new powers for local authorities to stage motor races on public roads.
David Cameron unveiled the move as he opened Williams' new F1 engineering facility in Oxfordshire, saying it would mean "more races, more events, more money coming into our country".
He said: "We're going to change the rules so that local councils are able to make the decision so you don't have to have a private member's Bill through Parliament, which we think will be great news for British motor sport."
The Prime Minister also hailed the F1 industry, saying it was "an amazing success story, eight of the 11 teams based here in the United Kingdom, 41,000 people working in the industry in the Oxford area alone, working for about 4,300 companies".
London Mayor Boris Johnson has signalled he is ready to support the idea of a Monaco-style Grand Prix on the streets of the capital.
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