Formula 1 racing teams Red Bull and Sauber have issued tributes to test driver Maria de Villota, who has died at the age of 33.
Christian Horner - On behalf of everyone in the team, we send our sincere condolences to Maria’s family at this difficult time"
Sauber tweeted: "We are shocked to hear about the death of María de Villota. Our sincerest condolences and sympathy to her family for this tragic loss."
Christian Horner, team principal of Red Bull, said: "We were extremely saddened to learn of the loss of Maria de Villota.
"On behalf of everyone in the team, we send our sincere condolences to Maria’s family at this difficult time"
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