Hi Pinto asphyxiation yes high on my list
Could be the most likely scenario
Hard to know which building but there is not one open window to be seen, there are no roof vents to be seen, it is winter in Sth Africa and they were young so you can be certain there were far too many people there, so what sort of heating ??
Carbon monoxide poisoning can very sudden and can cover a wide number of people at the same time and it does not smell
Just a sad occasions of kids having fun, not doing anything wrong, just wrong place, wrong time
