Why are iron ore stocks falling

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BHP BILLITON LIMITED (NYSE: BHP) Delayed: 84.96 +0.01 (0.01%)
Previous Close $84.95    52 Week High $39.12 
Open $84.90    52 Week Low $18.46 
Day High $85.31    P/E N/A 
Day Low $84.37    EPS $0.00 
Volume 2,190,571       

Fortescue Metal Group Ltd American Depositary Shares (AMEX: FSUGY) Delayed: 23.43 +0.04 (0.17%)
Previous Close $23.39    52 Week High $9.50 
Open $23.39    52 Week Low $1.99 
Day High $23.60    P/E N/A 
Day Low $23.36    EPS $0.00 
Volume 122,174       

RIO TINTO PLC (NYSE: RIO) Delayed: 94.14 -1.11 (1.17%)
Previous Close $95.25    52 Week High $40.19 
Open $94.82    52 Week Low $21.89 
Day High $94.93    P/E N/A 
Day Low $93.61    EPS $0.00 
Volume 1,082,102