Post-race investigations are commonplace on a Sunday night in Formula 1 but the hours after the United States Grand Prix produced one of the more unusual stewards' inquiries involving race winners Red Bull.

Red Bull were fined 50,000 euros for a pre-race rules breach on safety grounds which saw a team member re-enter the "gate well" in the "proximity of the second grid position", which belonged to McLaren's Lando Norris, once the cars had pulled away for the formation lap in Austin.

Half of the fine is suspended pending any similar breach over the rest of this season.

Stewards said that marshals reported the individual "did not appear to react to their efforts to prevent him from entering the gate well area". Red Bull said that their team member was not aware of the efforts of the mars

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