NEW YORK (Reuters) - U.S. prosecutors seeking to
recover money for victims of Bernard Madoff's fraud Tuesday
filed a lawsuit to seize more assets of a longtime back-office
supervisor of the now-imprisoned Ponzi schemer.

The amended civil complaint filed in Manhattan federal
court seeks more than $5.1 million of assets from the onetime
supervisor Annette Bongiorno, up from the $2.7 million sought
in June.

Prosecutors said Bongiorno, who worked for Madoff for more
than 40 years, "knowingly perpetuated" her former boss's fraud
by answering client questions about their supposed investments,
"overseeing the fabrication" of account statements and other
documents, and distributing those statements to clients.

A lawyer for Bongiorno did not immediately return a call
seeking comment.

The latest complaint seeks to require Bongiorno to forfeit
homes in Manhasset, New York, and Boca Raton, Florida, for
which she allegedly paid a respective $1.4 million and
$862,000, as well as a 2007 Mercedes Benz for which she paid
$66,000.

Prosecutors said they still seek other assets held by
Bongiorno, including bank accounts; $1.3 million that she and
her husband allegedly used to buy a $6.5 million Boca Raton
condominium; a 2005 Bentley Continental; and another Mercedes.

The government said all these assets are traceable to the
fraud at Bernard L. Madoff Investment Securities LLC, and
should be used to compensate victims.

It is also seeking to recover about $2.3 million of assets
from JoAnn Crupi, another longtime Madoff employee.

Neither Bongiorno nor Crupi has been criminally charged.

Madoff, 72, pleaded guilty in March 2009 to running an
estimated $65 billion Ponzi scheme. He is serving a 150-year
sentence in a North Carolina federal prison.

The case is U.S. v. $304,041.01 on Deposit at Citibank NA
et al, U.S. District Court, Southern District of New York, No.
10-04858.
(Reporting by Jonathan Stempel, editing by Gerald E.
McCormick)