|Piquet testified that he was ordered to crash by his bosses [GALLO/GETTY]
Renault have parted company with flamboyant Formula One team boss Flavio Briatore and his deputy Pat Symonds after accepting allegations that last year's Singapore Grand Prix was fixed.
The two men were due to appear before the governing FIA in Paris on Monday to answer charges, unprecedented even in a sport often mired in controversy, that the team ordered Brazilian Nelson Piquet to crash deliberately to help Spanish team mate Fernando Alonso win.
Renault said in a statement they would not dispute the allegations.
"It (Renault) also wishes to state that its managing director, Flavio Briatore, and its executive director of engineering, Pat Symonds, have left the team," it added.
Italian Briatore led the team to two Formula One constructors' and drivers' championships with Alonso in 2005 and 2006 after also winning titles with Benetton and Michael Schumacher in 1994 and 1995.
A business partner of Formula One's commercial supremo Bernie Ecclestone, with the two co-owning English Championship (second division) football club Queen's Park Rangers, Briatore is also Alonso's manager.
A familiar face in celebrity magazines, with a jet-setting lifestyle, the perma-tanned nightclub owner is also a leading figure in the Formula One Teams' Association (Fota) that threatened a breakaway series until recently.
While Briatore focused on business and the bigger picture, Symonds effectively ran the race strategy side and his departure will be a major blow for the team.
No replacements for either man were named.
International Automobile Federation (FIA) president Max Mosley had already said he considered the case to be more serious than the 2007 spying controversy that cost McLaren a $100 million fine and loss of all their constructors' points.
Sept 28 2008 Piquet crashes on lap 13/14 of the Singapore Grand Prix. Alonso moves into the lead behind the safety car having just refuelled and goes on to win the race.
Aug 3 2009 After scoring no points from 10 starts, Renault withdraw Piquet from
Aug 30 FIA open investigation into the 2008 Singapore race.
Sept 4 FIA announce Renault will face
charges of fixing the Singapore race.
Sept 11 Renault start criminal proceedings against Piquet and his father for alleging the team rigged the Singapore race. Piquet offered immunity from prosecution by FIA president Max Mosley if he told the truth.
Sept 16 Renault announce it would not contest the race-fixing charges and boss Flavio Briatore and director of engineering Pat Symonds leave the team.
The FIA's world motor sport council can impose various penalties for fraudulent conduct, including permanently excluding a team from the championship.
Piquet, 24, was dropped by Renault in August after failing to score a point in 10 races and has testified to the FIA that he was told when and where to crash during the night race.
In a statement subsequently leaked to the media, he told FIA investigators he met Symonds and Briatore before the September 28 race in the team boss's office.
"Mr Symonds, in the presence of Mr Briatore, asked me if I would be willing to sacrifice my race for the team by 'causing a safety car'," said Piquet, who was promised immunity from prosecution by the FIA if he told the truth.
The Brazilian added he had been "in a very fragile and emotional state of mind" at the time because of uncertainty about the renewal of his contract for 2009 and hoped his agreement would improve his position.
"Mr Symonds took me aside to a quiet corner and, using a map, pointed me to the exact corner of the track where I should crash," said Piquet in the July 30 statement.
Alonso, who has denied all knowledge of any plot, pitted for fuel on lap 12 and Piquet then crashed at a place where his car could not be easily moved, bringing out the safety car.
The Spaniard went on to win after rivals were penalised for pitting when the safety car was deployed, a rule that has since been changed. The crash caused considerable speculation at the time among rival teams and drivers.
Symonds was evasive in an interview with FIA investigators at the Belgian Grand Prix that was also leaked to the media.
Asked if he had been aware there was going to be a crash on lap 14, he replied: "I don't want to answer that question".
Symonds declared at a later stage: "I have no intention of lying to you. I have not lied to you but I have reserved my position a little."
Renault and Briatore had in turn accused Piquet and his father, a triple world champion and namesake, of false allegations and attempted blackmail and begun criminal proceedings in France.