Why are iron ore stocks falling

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BHP BILLITON LIMITED (NYSE: BHP) Delayed: 78.28 -1.95 (2.43%)
Previous Close $80.23    52 Week High $39.12 
Open $78.11    52 Week Low $18.46 
Day High $78.67    P/E N/A 
Day Low $77.98    EPS $0.00 
Volume 501,473       

Fortescue Metal Group Ltd American Depositary Shares (AMEX: FSUGY) Delayed: 25.38 -0.02 (0.08%)
Previous Close $25.40    52 Week High $9.50 
Open $25.13    52 Week Low $1.99 
Day High $25.51    P/E N/A 
Day Low $25.13    EPS $0.00 
Volume 6,918       

RIO TINTO PLC (NYSE: RIO) Delayed: 88.29 -2.96 (3.24%)
Previous Close $91.25    52 Week High $40.19 
Open $87.87    52 Week Low $21.89 
Day High $88.42    P/E N/A 
Day Low $87.79    EPS $0.00 
Volume 1,147,274