Alonso was running immediately behind Gutierrez as the pair approached Turn 3 at speed, but made contact with the rear of the Mexican’s car as they entered the braking zone, sending the Spaniard into the left-hand wall.
As Gutierriez spun to a stop, Alonso was pitched into a barrel roll as he went side-on into the gravel. His car was then launched into the air, with its tub eventually coming to rest against the tyre wall at the rear of the gravel trap.
Despite the obvious severity of the accident, Alonso was able to clamber unaided from the wreckage, with Gutierrez also climbing from his car seemingly unharmed as the safety car was deployed.