Carbon Monoxide Deaths?

Carbon monoxide is a byproduct of incomplete combustion (low oxygen levels) and CO poisoning/death can happen with poorly maintained furnaces, enclosed spaces, etc. But at a Sandals Resort in the Bahama's? It may have been possible for the incident in SA because its winter (see photos). But how cold could it have been inside a club full of dancing teenagers? And wouldn't they have wanted to keep it relatively cool in there, ie., not having a furnace blasting? East London, South Africa forecast nighttime low temperatures June 29 - July 2 are 45 - 55 degrees F….

https://www.msn.com/en-us/news/crime/what-we-know-about-the-mysterious-deaths-of-21-teens-at-a-nightclub/ar-AAZ0uia

https://www.cbsnews.com/miami/news/carbon-monoxide-poisoning-official-cause-of-death-american-tourists-bahamas-resort/