Red Bull boss Christian Horner says it should not have been possible for a fan to get on to the track at the Singapore Grand Prix, as investigations continue in to what happened.
A 27-year-old man was arrested by Singapore police after walking onto the track on the straight between Turns 13 and 14 during the race.
CCTV footage of the incident showed that he climbed through a hole in the fence directly onto the racing line before beginning walking up the circuit.
It was only when he spotted the fast approaching Sebastian Vettel that he began running. He swiftly crossed the track before again walking to clamber through another hole in the fence.
The FIA is now awaiting the regular post-race report from the Marina Bay's Clerk of the Course into the running of the event to find out more details of what happened.
It is only when it has been presented with those facts that it will decide what action should be taken.
Horner, whose driver Daniel Ricciardo reckoned his chances of the win were wrecked by the man bringing out the safety car, said he had faith that the FIA would treat the matter seriously.
Speaking about the man on the track, Horner said: "It looks like he has come straight out of a nightclub.
"It should not be possible in reality [to get on the track], so I am sure the FIA who are responsible for all things safety wise will be having a good look at that.
"We need to look at how the crowd can be prevented from ending up on the circuit because it is not only dangerous for him but also for the drivers."
Mercedes motorsport boss Toto Wolff added that he too had felt concern for the safety of the drivers because of the man.
"He must have had a couple of beers,” said Wolff. "I was alarmed because that can cause a massive accident and it's dangerous for the drivers. I don't know how he came in there."