OSLO, Norway – A lightning bolt struck 91 auto racing fans at a racetrack in Norway Sunday, and 45 people were taken to hospital with minor burns, police said.

“No one was seriously injured,” police officer Hans Eng told the Associated Press. “But some of them will stay in the hospital for observation.”

The lightning hit a hill where spectators at the rallycross were sitting. Rallycross is a form of sprint-style automobile racing on a closed circuit.

The race, a national championship, was called off after the incident.

Eng said 16 ambulances and three medical helicopters were brought to the scene at Flisa, about eight kilometers from the Swedish border.