Oct.21 (GMM) A stewards inquiry following the Brazilian grand prix has put a question-mark alongside Kimi Raikkonen's world championship triumph on Sunday.

It has emerged from Interlagos that investigations are currently taking place regarding the BMW-Sauber and Williams teams, after fuel samples from the cars failed post-race scrutineering checks.

Nico Rosberg (Williams), Robert Kubica and Nick Heidfeld (BMW) finished the race fourth, fifth and sixth respectively, meaning that if they are disqualified, Lewis Hamilton would inherit three additional points.

If confirmed, the McLaren rookie would be crowned world champion ahead of Raikkonen and Fernando Alonso.

BMW and Williams representatives were indeed summoned to the stewards' office, according to a spokesperson for the FIA.

A BMW spokesperson confirmed that the issue relates to the temperature of the fuel sampled, and a BBC radio news item speculated that the fuel may have been too cold.