Two women who worked in a pavilion belonging to an international organization told AFP that the facilities had been fitted with makeshift electrical wiring. There were exposed wires and water dripped from the roof onto their electrical panel, they said on condition of anonymity, adding that they reported the issues but to no avail. Delegates said neither the fire alarms nor the sprinklers went off, though Brazilian volunteers handled the evacuation smoothly.

Probably just some idiots mishandling equipment or a phone battery or something.