The monster truck had been performing a stunt when it ploughed into the crowd
Three people were killed in the tragedy.
According to Hans Gerritsen, the mayor of Haaksbergen, other 18 people have been injured.
The third death was announced on September 29 and five are critically ill in hospital, following the event in Haaksbergen in Overijssel province.
Video footage shows the modified pick-up with outsized tires driving over a row of cars as part of the show, but then veering off course.
A boy, a man and a woman died.
Helicopters helped ferry the injured to hospitals in three nearby towns.
“A so-called monster truck drove into a crowd of spectators. A terrible accident with two dead victims,” town authorities said on their website on September 28.
Video of the accident posted on social media showed the truck revving hard and then riding over six cars before suddenly heading towards spectators who were separated from the show by metal barriers.
Screaming, some managed to get away but others had no time to escape.
The driver of the truck has been detained and an inquiry has been opened, police said, quoted by local media.
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