One of the membrane sheets spanning over the stands in Salvador gave way under the weight of water gathering on it. Similar accident was prevented from happening at another segment of the roof, BBC reports.

Less than two months from opening Arena Fonte Nova has its first accident. Downpour over Salvador da Bahia caused one of 36 membrane sheets to collapse on Monday.

Normally the rain water should be transported down, but yesterday this didn't work well throughout the stadium. In a few places water stayed atop the roof and challenged the membrane's strength. One sheet gave way (StadiumDB.com understands it remains intact, but connectors failed to withstand the weight), while workers saved another by pouring the rainfall out with buckets.

It's not clear at this point whether there is a design flaw, installation error or a different cause to why this happened. The case will now be examined as there is just over 2 weeks left until the Confederations Cup begins in Salvador and five other Brazilian cities.