Twenty-five people have been treated for burns in northern Switzerland after they walked across hot coals as part of a team-building exercise.
Thirteen of them were taken to hospital and treated for more severe injuries after the incident on Tuesday evening, the BBC reports.
A large emergency response, including 10 ambulances, arrived at the private event around 18:00 local time.
The group walked over a bed of coals that was several metres long, police said. Officials have opened an investigation and taken evidence from the site, which is in the Au peninsula just south of Zurich.
Walking across a bed of hot coals, often known as fire-walking, is sometimes used in motivational courses and charity events. It involves walking barefoot over a bed of hot embers or coals. It is used in many parts of the world as a rite of passage or test.
