The Formula 2 Feature Race at the Jeddah Corniche Circuit has been red-flagged after just 20 seconds of action, due to a start-line crash.
Theo Pourchaire, the Alfa Romeo-backed junior, stalled his car on the grid and was struck by the accelerating Enzo Fittipaldi.
The red flags were immediately shown to neutralise the race.
The FIA have since released a statement confirming both drivers have been taken to hospital.