A Samsung Experience Store in Singapore caught fire early Tuesday. The blaze threatened nearby shops and caused unspecified damage. This incident is the latest in a string of fire-related thorns in Samsung's side.
http://www.notebookcheck.net/Samsung-store-catches-fire-the-day-before-the-Galaxy-S8-launches.209194.0.html
Probably one of the workers tried to check out the newest technology himself and turned on one of the phones