Why are iron ore stocks falling

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BHP BILLITON LIMITED (NYSE: BHP) Delayed: 95.15 -1.22 (1.27%)
Previous Close $96.37    52 Week High $39.12 
Open $97.24    52 Week Low $18.46 
Day High $97.24    P/E N/A 
Day Low $94.63    EPS $0.00 
Volume 1,656,714       

Fortescue Metal Group Ltd American Depositary Shares (AMEX: FSUGY) Delayed: 25.66 +0.12 (0.47%)
Previous Close $25.54    52 Week High $9.50 
Open $26.08    52 Week Low $1.99 
Day High $26.08    P/E N/A 
Day Low $25.59    EPS $0.00 
Volume 60,871       

RIO TINTO PLC (NYSE: RIO) Delayed: 103.30 -1.48 (1.41%)
Previous Close $104.78    52 Week High $40.19 
Open $105.09    52 Week Low $21.89 
Day High $105.17    P/E N/A 
Day Low $103.02    EPS $0.00 
Volume 2,450,649