The Fraud Section at the Justice Department and the Commodity Futures Trading Commission have expanded the investigation into whether traders manipulated auctions on government debt, according to people privy to the matter.

Sources said banks are asked to turn over documents relative to the matter. The two agencies sent the requests this summer to several banks, including Goldman Sachs Group Inc. and other Wall Street banks, which serve as primary dealers.

It was not certain whether all 22 primary dealers, authorized to deal directly with the government on selling Treasury bonds, have received the requests.

Goldman seemed to state the inquiries Tuesday in a regulatory filing, stating regulators were looking into activities linked to the offering and auction of many securities, as well as when-issued trading.

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