Motor racing-Red Bull F1 team mourn death of founder Mateschitz at 78

FILE PHOTO: Formula One - F1 - Abu Dhabi Grand Prix 2010 - Yas Marina Circuit, Abu Dhabi, United Arab Emirates - 14/11/10 (L-R) Red Bull Racing Chief Technical Officer Adrian Newey, Team Principal Christian Horner, CEO and Founder of Red Bull Dietrich Mateschitz and Red Bull Motorsport Consultant Dr Helmut Marko Mandatory Credit: Action Images / Crispin Thruston

AUSTIN, Texas (Reuters) -Formula One and the championship-leading Red Bull team mourned the death of the energy drink company's Austrian founder Dietrich Mateschitz on Saturday at the age of 78.

Red Bull Racing principal Christian Horner confirmed the news ahead of qualifying for the U.S. Grand Prix in Austin, Texas, where the team can clinch a fifth constructors' championship.