Asia, Europe markets fall on U.S. worries

• Story Highlights
• Nikkei 225 index sheds 2 percent to 12,750.10
  
• European stocks also fell in early trading. British FTSE 100 retreated 1.2 percent
  
• Reports: Japan's top 3 banks hold combined $44B in Fannie Mae, Freddie Mac debt
  
• Fannie Mae, Freddie Mac hold or back about half the outstanding mortgages in U.S.
  
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