McLaren's Fernando Alonso was involved in a heavy crash on the final day of pre-season testing in Barcelona but is "ok and conscious", officials said.
The Spaniard, twice world champion, hit the wall on the exit of Turn Three at speeds of up to 150 miles per hour.
The 33-year-old was taken to the circuit's medical centre for initial treatment before being airlifted to hospital for precautionary checks.
"Fernando Alonso crashed in the end of Turn Three. The car has gone back and crashed into the wall," a statement from the circuit said.
The Circuit de Catalunya tweeted: "It seems that Alonso is ok. We hope that everything's alright and all ends with just a shock!!"
It is unsure whether the crash was a result of a driver error or a malfunction with the car.