UPDATE 10 p.m.
Xerox Corp. says that access to food stamp systems has been restored in 17 states that were affected by a temporary outage.
People in Ohio, Michigan and Texas were unable to use food stamp debit-style cards for hours on Saturday. Xerox said a routine test of backup systems resulted in a temporary system failure.
Xerox Spokeswoman Jennifer Wasmer said in an email that it took time to restore the system and make sure it was fully functional.
Michigan residents in a federal food program are being denied purchases with their debit-style cards because of technical problems.
Dave Akerly, a spokesman for the state Department of Human Services, says it's a problem Saturday between retailers and Xerox, the company that provides high-tech services. The glitch extends beyond Michigan to at least 16 other states.
The federal program is commonly known as food stamps, although transactions are performed electronically in Michigan with a card called the Bridge Card. Xerox is telling retailers to record sales by hand if possible.
At Metro Foodland in Detroit, manager Charlonda Love says the store has been empty because most customers use the card.