LOS ANGELES - Legal pressures against Merrill Lynch & Co. mounted yesterday as federal investigators broadened their investigation into the firm's role in the Orange County investment pool fiasco.

The Securities and Exchange Commission and other federal investigators are examining several aspects of the financial disaster, including the contributions made by Merrill Lynch employees to Robert L. Citron, who resigned as treasurer-tax collector on Dec. 4, four days after the county's investment pool losses were first revealed.

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