" Gilles Glicenstein, BNP Paribas chief executive, suggested that "there is still some information missing to understand what happened" at Societe Generale. "
Understatement of the year.
But to answer your question Dev, massive incompetence by numerous authorities inside and outside the bank
Which is why the Financial authority in Singapore cam out all holier than thou during the Nick leeeson scnadalas their Futures Exchnage would have known the extent of the positions and known they were excessive.