Indonesia stock exchange: Dramatic CCTV video shows moment floor collapses at Jakarta tower building

More than 70 people hurt as mezzanine level caves in and plunges into lobby

Dramatic video shows the moment a mezzanine floor collapsed at the Indonesia Stock Exchange, injuring more than 70 people.

In the CCTV footage, a crowd of people – thought to be college students - are seen waiting to enter a room on the second storey of the Jakarta tower before the floor gives way beneath them.

In another clip, a crowd can be seen fleeing in terror as slabs of flooring, along with glass and people plummet into the main lobby.

No one is thought to have been killed but a nearby hospital said it was assessing 30 injured people, some of whom suffered serious bone fractures.

Jakarta governor Anies Baswedan visited the site and said the city will "audit the building", which was last inspected by authorities in May.

"I have conveyed to the building's management that the audit of the construction should start tonight so that the activities of the stock exchange are not disturbed," Baswedan told reporters.

"There was a rumbling noise but it wasn't an explosion. It was like something had fallen, and suddenly the floor we were standing on fell away," said student Alfita, 20, who uses one name. She escaped with light bruises.

"Slabs of concrete started to fall, there was lots of dust. Water pipes had burst," said Megha Kapoor, who works in the building and was in the lobby at the time.

Reports suggested up to 77 people had been hurt, including students who were in the building on a college trip.

Police have ruled out a bomb as the cause of the collapse.

Safety standards are often loosely enforced in Indonesia. Last year, a fire that ripped through a fireworks factory on the outskirts of Jakarta killed around 50 people in one of the country's worst industrial accidents. A police investigation found multiple safety violations.

Reuters contributed to this article