U.S. private employers added a scant 38,000 jobs in May, far below economists' expectations and the lowest level since September 2010, a report by a payrolls processor showed Wednesday.

Economists surveyed by Reuters had forecast the ADP Employer Services report would show a gain of 175,000 jobs.

April private payrolls were revised down to an increase of 177,000 from the previously reported 179,000.

The report is jointly developed with Macroeconomic Advisers LLC.