The forged letters are "cause for alarm," said a CFTC commissioner.

The Commodity Futures Trading Commission (CFTC) has called on the Department of Justice (DOJ) to investigate fraudulent comment letters it has received on proposed rules that the agency is considering, said CFTC Chairman Gary Gensler.

At an agency meeting Tuesday, Gensler said the CFTC recently became aware of the fraudulent letters and referred them to the DOJ. He said nothing more about the letters.

The news of the forged letters is "cause for alarm," said Commissioner Michael Dunn.

The CFTC has solicited comments from the public since October, when it began proposing rules to implement the sweeping Dodd-Frank Wall Street Reform Act.

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