In the subsequent Royal Automobile Club (the UK organising and regulatory representative of the FIA at the time) investigation, it was discovered that the crash itself caused non-fatal injuries but Siffert had rather been killed by smoke inhalation.
Na posterior investigación do Real Automóbil Club (no Reino Unido era a organización representativa de regulamentación da FIA no momento) descubriuse que o propio accidente non causara lesións mortais, e que Siffert morrera por inhalación de fume.