The story of Brazilian trader Paulo Sergio Silva, aged 36, shooting himself in the chest on the floor of the Sao Paolo Commodities & Futures Exchange has been covered by news sources ranging from Reuters
here, to the Huffington Post
here.
At present, there is little explanation as to why he did this.
The most damning detail is that BM&F Bovespa, which operates the exchange, issued a statement explaining trading in commodities and derivatives had been suspended for all of 15 minutes following the shooting incident.