NEW YORK (Reuters) - Wells Fargo & Co's account scandal is not limited to its consumer banking sector, U.S. Senator David Vitter told the bank's chief executive in a letter.

Thousands of small business owners were also impacted by Wells Fargo's practices, wrote Vitter, a Republican from Louisiana, in a letter dated Sept. 29 to Wells Fargo chief executive John Stumpf and seen by Reuters.

Vitter demanded a "full accounting" of small business owners affected by "fraudulent activity." Around 10,000 small business accounts were affected by improper Wells practices, people familiar with the matter said.

(Reporting by Suzanne Barlyn; Editing by James Dalgleish)