Lewis Hamilton could yet be crowned world champion after Brazilian Grand Prix stewards summoned representatives of BMW Sauber and Williams for alleged technical irregularities.
A BMW spokeswoman told Reuters that the investigation concerned fuel temperatures.
Williams driver Nico Rosberg finished fourth, with BMW Sauber's Robert Kubica and Nick Heidfeld fifth and sixth respectively.
Should they be disqualified, Hamilton would be promoted to fourth place, enough to see him crowned as world champion.
Kimi Raikkonen won the race and, should the orginal result stand, claimed the world title by one point from both Hamilton and his McLaren team-mate Fernando Alonso.
More to follow...
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