UPDATE: Madoff Investors are now being investigated...

from The Wall Street Journal

The criminal investigation into who knew about Bernard L. Madoff's massive fraud has expanded to include some of his highest-profile investors.
Jeffry Picower and Stanley Chais, two philanthropists who invested heavily with Mr. Madoff, and Carl Shapiro, one of the money manager's oldest friends, are among at least eight Madoff investors and associates being scrutinized by the U.S. attorney's office in Manhattan.
Federal investigators have gathered evidence they think will show that Messrs. Picower and Chais told Mr. Madoff how much in returns they wanted. Their accounts soon would reflect those amounts, people familiar with the investigation said.
Prosecutors are continuing to probe Madoff family members and employees, but the investigation now includes investors who have claimed to be among the hardest-hit victims of the fraud, both directly and through their foundations. Mr. Madoff pleaded guilty in March and is set to be sentenced in June.
http://online.wsj.com/article/SB124261271530929129.html#mod=djemalertNEWS