Friday's second practice session for the US MotoGP at Laguna Seca has been red flagged with ten minutes to go following a fall for Valentino Rossi.
The Italian was unhurt in a fast lowside tumble on entry to turn three, but a section of airfence was damaged by his Ducati, forcing the halt. Rossi is currently ninth fastest.
Alvaro Bautista (Gresini Honda) and Cal Crutchlow (Tech 3 Yamaha) have also fallen without harm this afternoon.
Morning pace setter Dani Pedrosa (Repsol Honda) leads the way by 0.334s from Yamaha's Jorge Lorenzo.
The session will restart once the repairs are complete.