In the tiny Frisian village of Raard, 17 people were injured, three seriously, when a car ploughed into a group of people watching a New Year bonfire.
According to news agency ANP, the 42-year-old female driver was not drunk and had not acted deliberately. She had three children, including one of her own, in the car at the time.
Around 40 people were watching the New Year bonfire when the car drove into them. The victims were taken by road and air ambulance to hospitals all over the north of the country.
Several of the victims were allowed home on Tuesday afternoon but 12 remain in hospital and several are in a very serious condition, local officials said.
Police are trying to find out how the accident happened. According to one theory, the woman was blinded by the fire and hit the crowd. Others say there was poor visibility.