They started up two forklift truck and drove them around the factory site. There was a collision between one of the trucks and one of the posts that support the factory’s roof.
The roof collapsed, killing one of the boy and an 11-year-old girl. The boy’s brother (17) and his 11-year-old half-sister survived the accident.
The accident happened inside the disused Infer Productions factory on the Guldendal, near to the canal in Mechelen. The factory closed a couple of years ago.