Reports in the British media suggest accusations against Renault's F1 team go beyond it fixing the result of the 2008 Singapore Grand Prix.
The Independent newspaper is quoting a source within the sport's governing body, the FIA, as saying "other issues above and beyond Singapore are also to be looked at".
It also says the investigations into the alleged wrong-doing began at Spa-Francorchamps last weekend, with engineering boss Pat Symonds and Fernando Alonso among "senior Renault figures" interviewed multiple times.
However, former Renault test driver Franck Montagny has said he "did not believe" the claims could be true.
"Even when you are asked to let someone pass it is annoying," he said, "but to be made to deliberately have an accident is really something else."
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Re: F1 race-fix row deepens
Hurry up! Hurry up!
It is very grave!
It seems that the socks of F. Briatore were not at the standards of the FIA in Spa. Investigations will be led.
More seriously, Renault, Mercedes, Toyota, how to stay still in F1 in 2010?
Are-we the 1st of April?
Next year, we shall have well 24 Ferrari Cosworth!