Accused 'rogue trader' in custody

• Story Highlights
• Chief executive of Societe Generale denies French bank caused market turmoil
  
• French police search bank's headquarters as part of $7.2 billion fraud probe
  
• Bank blames a single rogue trader, Jerome Kerviel, for its losses
  
• Skeptics question whether a single trader could have managed such large sums
  
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