U.S. commander warns on al Qaeda plotting

• Story Highlights
• NEW: U.S. has lowered the risk of a large-scale domestic attack, Chertoff says
  
• "I think it would be imprudent of us to let down our guard," says Renuart
  
• "Tangible results" are needed to maintain credibility, recruit more, Renuart says
  
• U.S. intelligence analysts in July concluded al Qaeda had rebuilt operating capability
  
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