All but one of those killed were visitors to the warehouse.
She testified that although investigators believed the cause was probably an electrical failure, they could not determine the source because the fire destroyed possible indicators, and that there was no evidence of arson.
Most importantly, there were no fire alarms, , or smoke alarms in the building.
In 2014 or 2015, Almena told Police Officer Hector Chavez that no one lived in the building, and he repeated the same statement several months before the fire to Police Officer Brian Kline.