WASHINGTON -- The troubles facing Salomon Brothers Inc. mounted yesterday as securities regulators in 33 states announced that they have launched a joint investigation of the firm's recent abuses in the government securities market.

The investigation is separate from those of federal agencies that already have announced that they are investigating admissions by Salomon Brothers that it bought government securities in Treasury auctions in the names of customers over the last year without their permission and exceeded limits on the total amount of securities it could buy.

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