Bagnaia was involved in a horrific incident on the opening lap of the grand prix while leading, after he was flung from his Ducati exiting Turn 2.
The world championship leader then had his leg run over by KTM’s Brad Binder, who could do nothing to avoid him.
Seconds earlier, Bagnaia’s team-mate Enea Bastianini triggered a multi-rider incident at Turn 1 that took down Pramac’s Johann Zarco, Gresini duo Alex Marquez and Fabio Di Giannantonio, and VR46’s Marco Bezzecchi.
The race was red-flagged as Bagnaia received medical attention, with the Italian later taken to hospital in Barcelona for further checks.
Bastianini has also gone to hospital, with the factory Ducati team absent from the 23-lap restarted grand prix.
The race got back under way at just before 2:25pm local time, around 25 minutes after the original start, with Pramac’s Jorge Martin briefly upholding Ducati honour by jumping into the lead from fifth.
But this lasted all of three corners, as Maverick Vinales carved into the lead on his factory Aprilia, with team-mate Aleix Espargaro eventually moving into second on lap three.
Source: Autosport