Formula 1 and the FIA have confirmed that members of the public attempted to enter the race track during the first lap of the British Grand Prix.
Northamptonshire police had warned of "credible" evidence that a protest had been planned ahead of the weekend.
It has transpired that people had made an attempt to gain access to the live race track at Silverstone during the first lap of the race, which was red-flagged for a serious incident at turn one.
An FIA statement read: "We confirm that after the red flag, several people attempted to enter the track.
"These people were immediately removed and the matter is now being dealt with by the local authorities."
Apart from the Zhou accident, protesters were sat on the straight 😳 Marshalls cleared them as the red flag was waved. Dangerous, protest elsewhere… #F1#BritishGPpic.twitter.com/Nw1HcAxrnt
Esteban Ocon and Alex Albon were also involved, with the FIA confirming Zhou was conscious after the accident before being taken to the medical centre.