A mezzanine floor at the Indonesia Stock Exchange in Jakarta collapsed, injuring scores of people - many of the visiting students - under slabs of concrete and glass.

Television footage showed a chaotic evacuation from the main lobby, which was strewn with debris, and people being helped out of the building.

Police said that at least 77 people had been injured under a shower of glass and other debris on Monday. The victims were described as having mostly suffered leg and arm injuries.

The building is part of a two-tower complex, which was the target of a suicide bombing by Islamist militants in September 2000. Police ruled out a bomb as a cause of the latest collapse.

Emergency services cordoned off the complex as people fled the building, while the injured - including students visiting the building - were taken away by stretcher.