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Red Bull has launched an investigation after allegations of inappropriate behaviour were made against Christian Horner, the team principal of the company's Formula 1 team.

Horner, 50, has been Red Bull team principal since their first Formula 1 season in 2005, leading the Milton Keynes-based squad to seven drivers' titles and six constructors' triumphs during his 19 years in charge.

The investigation, which is being carried out by an external specialist barrister, was confirmed by the F1 team's Austrian parent company on Monday.

Horner says he denies the allegations "entirely".

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