More than a dozen banks and investment firms are suspected co-conspirators in a criminal probe by the Justice Department's antitrust division into alleged bid-rigging and price-fixing in the municipal financing market, according to a court filing.

The list of banks was "inadvertently" filed last week in U.S. District Court in Manhattan as part of defense lawyers' request for specific evidence from the government in a criminal case against three former executives of CDR Financial Products Inc., a California municipal-bond broker.

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