Indonesia's National police spokesman Setyo Wasisto said that at least 75 people sustained injuries in the incident on Monday, while no deaths were reported. According to the information from hospitals, 77 people were injured.
Posts containing CCTV footage of the incident are circulating on the web. The video shows that people fall several meters to the ground floor as the structure crumbles under their feet.
The incident prompted a chaotic evacuation from the building, with people fleeing the lobby through the piles of debris.
Those injured have been carried from the building and given first aid by medics right on the lawns outside the building.
"I helped evacuate the victims to the park and as far as I know, the worst injuries are fractures," Tito Sulistio, stock exchange's general manager, said as quoted by AFP.
Commenting on the incident, Wasisto said that most of those injured were students from the province of Palembang who visited the stock exchange as part of a tour.
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The stock exchange continued to operate despite the incident.