The Dutch Grand Prix Qualifying was red flagged in Q2, after an orange flare was thrown on the track by a spectator.
Afterwards, Mercedes team boss Toto Wolff warned fans about the dangers of doing this.
“First of all, you need to see the positives,” the Austrian said.
“The ambience is great here, the enthusiasm for Max [Verstappen] has ignited the whole country and that is perfect to see.
“My experiences are positive with the fans and it is a shame that there are a few total idiots out there that either drink or don’t consider what a flare could do to a driver.
“There was a flare out there that rolled over a straight. The flare and the pigeons. I don’t know who let the pigeons out but clearly, the flare is the most dangerous thing.
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“If such a can hits you, we have seen how in the past it can have lethal consequences. The halo wouldn’t help you with that.”
However, in Q3 another flare was thrown, but didn’t make it onto the track, so the session was not stopped this time.
This flare was thrown just as Lewis Hamilton was going through the pitlane, leading many to believe he was the target. Wolff says the Mercedes team was not able to determine if this was the case.
“We looked at the camera angles and Lewis was going through the pit lane. I don’t know if somebody threw it at him but it happened before he was actually at that point.
“Again, a few idiots and I hope that the organisers are having a grip on it with the securities,” he concluded.