Updated from 11:40 a.m. EDT

Seven former Enron officials, former Chief Financial Officer Andrew Fastow, and his wife were named in new indictments alleging fraud at the fallen energy trader's broadband unit, among other things.

Lea Weingarten Fastow, a onetime assistant treasurer for the company, surrendered at an IRS office in Houston on Thursday morning. She is charged with six counts, including conspiracy to launder money, filing false tax returns and conspiracy to commit wire fraud.

Six former employees of the company's Internet division gave themselves up at an FBI office in Houston. They include the former co-chief executives of Enron Broadband Services, Ken Rice and Joe Hirko; Kevin Hannon, the unit's chief operating officer; Dan Boyle, vice president; Ben Glisan, treasurer; and F. Scott Yeager, another executive.

Andrew Fastow was reindicted on 31 new counts, bringing the total number he faces to 109. Fastow already pleaded innocent to the accounting fraud that laid low the energy trader in December 2001, costing investors billions of dollars.

Several of the charges against Fastow stem for his participation in Enron's sale of several Nigerian barges to Merrill Lynch ( MER), which subsequently resold the barges to the LJM2 partnership set-up by Fastow. The barge transaction was used to generate inflated earnings for Enron and a guaranteed profit for Merrill.

The charges arising from the barge sale were contained in the original indictment filed against Fastow last year. But this time, prosecutors went out of their way to point a finger of blame at Merrill, even though the investment bank wasn't charged.

"There are many people at Enron and other institutions, including Merrill Lynch, who are responsible for reducing the seventh-largest corporation in America to rubble," Enron Task Force prosecutor Andrew Weissmann said, according to an Associated Press report.

The indictment accuses Merrill of being part of a conspiracy "to devise a scheme and artifice to defraud'' Enron and its shareholders.

Earlier this year, the nation's biggest brokerage agreed to pay $80 million in fines and penalties to the Securities & Exchange Commission over its role in the barge transaction and other financing deals for Enron. The SEC had alleged that Merrill aided-and-abetted the accounting fraud at Enron. Four former Merrill investment bankers also were charged by the SEC with aiding-and-abetting.

Meanwhile, the former broadband unit workers were said by the SEC to have personally reaped more than $150 million in unlawful profits. They are charged with misleading investors about the operation's prospects when its business model "was not commercially viable," the SEC said in a release.

"The actions described in the amended complaint illustrate the lengths to which some at Enron would go to create the illusion of stellar financial performance," said Stephen M. Cutler, director of the SEC's Division of Enforcement. "It is especially reprehensible that these defendants opted for their own financial well-being at the expense of Enron's shareholders."