Nico Rosberg set the pace in final practice for the Russian Grand Prix on Saturday morning as the session was called early following a heavy crash for Toro Rosso driver Carlos Sainz Jr.
With 25 minutes remaining, the session was stopped when Sainz slammed into the wall at turn 13, pitching in under the TecPro barrier at the fastest point of the circuit.
A loss of power on the car meant that Toro Rosso could not make contact with its driver, causing concern as the medical crew was sent to the crash site to tend to Sainz.
Replays showed that Spaniard lost the back-end of his car under braking coming into turn 13, causing him to hit the wall on the left-hand side of the track before travelling down the track and into the wall at the end of the high-speed straight.
After being extricated from the car, Sainz was shown on TV cameras to be moving around on a stretcher, giving a thumbs up before being placed into an ambulance.
“The driver is conscious and is still in the process of being extricated,” FIA media chief Matteo Bonciani told reporters. “When we know something, we will let you know.”
Toro Rosso team boss Franz Tost added: “As far as I am informed, he is conscious. He is now with the doctor. I think that he is so far okay.”
With qualifying for the Russian Grand Prix due to start in just two hours’ time, it is unlikely that Sainz will be able to take part in the session, with Tost believing it to be “too risky”.
The amount of damage caused to the barrier could also result in delays across the course of Saturday’s running, with GP3 scheduled to race before the F1 qualifying session. The early sunset in Sochi could also cause problems towards the end of the day.