Feb. 5 (Bloomberg) -- U.S. tax authorities hold information on as many as 29,700 Americans with untaxed Swiss accounts, Blick reported, citing William Sharp, a U.S.-based lawyer.

Of 33,000 Americans who approached authorities to declare untaxed funds, between 80 percent and 90 percent held Swiss accounts and the U.S. “now knows exactly how the dirty money flows,” Sharp said, according to the Swiss newspaper.

--Editors: Linda Shen, Sara Marley

To contact the reporter on this story: Leigh Baldwin in Zurich at lbaldwin3@bloomberg.net

To contact the editor responsible for this story: Mariajose Vera at mvera1@bloomberg.net