FIA to launch probe on '08 Singapore GP

Alonso's success was sealed by the timing of a safety car in the early stages of the inaugural event - which had been called out when Piquet crashed into the wall shortly after his team-mate stopped for fuel.

The timing of Piquet's crash prompted wild conspiracy theories that the Brazilian had been ordered to deliberately spin to help Renault take its first victory of the year. Piquet himself insisted at the time that the accident had been caused by him simply trying too hard.

"It was my mistake," said Piquet. "We tried two extreme strategies with Fernando quite short and me quite long in the hope of getting a safety car. If I hadn't crashed I would have been lucky with the safety car later in the race because I was very happy.

"We're always scraping the walls, and once you've touched the wall a little too much and lose control that's it."

It is understood, however, that fresh evidence about the events that took place in the race have now come to light - which has prompted the FIA to step in.

Piquet was dropped by Renault after this year's Hungarian Grand Prix, and has been outspoken in his criticisms of the outfit - and in particular team principal Flavio Briatore. It is not clear if the Brazilian himself has been a catalyst for the investigation, or if the evidence has come from elsewhere.

The FIA has not elaborated on the details of its inquiry, but a spokesperson confirmed to AUTOSPORT that an investigation was under way.

"The FIA can confirm that an investigation is underway regarding alleged events at a previous world championship race," said the spokesperson.

Should the FIA investigation suggest there is any evidence of foul play involved, then the governing body could call a hearing of the World Motor Sport Council to discuss the matter.