This was the moment a massive crane collapsed at Sao Paulo's World Cup stadium.<br/> <br />This footage was shot by architect Marcio Campos, who was visiting the construction site.<br/> <br />Last Wednesday's accident killed two workers. The crane fell as it was lifting a roof that weighed 420 tonnes.<br/> <br />It damaged the stadium, that is slated to host the opening match of the 2014 World Cup.<br/> <br />Construction workers were rushing to meet a December deadline set by FIFA.<br/> <br />The accident casts a shadow on preparations for the World Cup, that's already been plagued with delays, budget overruns, and a drastic downsizing of public transport projects that had been planned for the benefit of Brazil's 200 million residents.
