Securities and Exchange Commissioner Richard Roberts, cautioning that some letter of credit banks may be pressuring municipal bond firms to give banks underwriting business, said Saturday he will seek regulations if necessary to block such "tying" arrangements.

Speaking to dealers meeting in Irvington, Va., Mr. Roberts also continued to press for regulation of sales of some conduit or unrated bonds. He outlined some new options for dealing with the problem of risky bonds, beyond his recent call for written suitability determinations.

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