Just when the mutual fund scandal seemed to be offering little in the way of new twists and turns, the plot thickens.

The Securities and Exchange Commission on Monday plans to file additional claims and add new defendants to its civil fraud suit against Invesco, as previously stated in a motion filed with the U.S. District Court in Denver earlier this month. While the names of the defendants were withheld, the amended complaint is expected to charge one of the Denver-based fund shop's portfolio managers, according to a source familiar with the matter.

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