Traders work in the Crude & Natural Gas Options pit at the New York Mercantile Exchange June 10, 2009.   REUTERS/Shannon Stapleton By Christopher Doering
WASHINGTON, Sept 16 (Reuters) – The top U.S. futures regulator and two main commodity exchanges were conflicted on Wednesday over who should set tougher position limits if the the Commodity Futures Trading Commission proceeds to take action to curb market manipulation.

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