The Itaquerao stadium, due to host the opening match of the 2014 World Cup, was 94% completed at the time of the accident.
The damage could delay the completion of the stadium, which must meet FIFA's December deadline.
More top news
The head of football's anti-discrimination body Kick It Out has responded to attacks by QPR defender Rio Ferdinand in his autobiography
Prime Minister David Cameron and his wife Samantha surprised diners in Solihull by dropping into fast food chain Five Guys for burgers.
Imposing age ratings on music videos is a step in the right direction but it's currently impossible to police endless inappropriate content.