OMAHA, Neb. - The young father stood in line at the Kmart layaway counter, wearing dirty clothes and worn-out boots. With him were three small children.

He asked to pay something on his bill because he knew he wouldn't be able to afford it all before Christmas. Then a mysterious woman stepped up to the counter.

"She told him, 'No, I'm paying for it,'" recalled Edna Deppe, assistant manager at the store in Indianapolis. "He just stood there and looked at her and then looked at me and asked if it was a joke. I told him it wasn't, and that she was going to pay for him. And he just busted out in tears."

At Kmart stores across the country, Santa seems to be getting some help: Anonymous donors are paying off strangers' layaway accounts, buying the Christmas gifts other families couldn't afford, especially toys and children's clothes set aside by impoverished parents.

Before she left the store Tuesday evening, the Indianapolis woman in her mid-40s had paid the layaway orders for as many as 50 people. On the way out, she handed out $50 bills and paid for two carts of toys for a woman in line at the cash register.

"She was doing it in the memory of her husband who had just died, and she said she wasn't going to be able to spend it and wanted to make people happy with it," Deppe said. The woman did not identify herself and only asked people to "remember Ben," an apparent reference to her husband.

Deppe, who said she has worked in retail for 40 years, had never seen anything like it.

"It was like an angel fell out of the sky and appeared in our store," she said.

Most of the donors have done their giving secretly.

Dona Bremser, an Omaha nurse, was at work when a Kmart employee called to tell her that someone had paid off the $70 balance of her layaway account, which held nearly $200 in toys for her 4-year-old son.

"I was speechless," Bremser said. "It made me believe in Christmas again."

Dozens of other customers have received similar calls in Nebraska, Michigan, Iowa, Indiana and Montana.

The benefactors generally ask to help families who are squirreling away items for young children. They often pay a portion of the balance, usually all but a few dollars or cents so the layaway order stays in the store's system.

The phenomenon seems to have begun in Michigan before spreading, Kmart executives said.

"It is honestly being driven by people wanting to do a good deed at this time of the year," said Salima Yala, Kmart's division vice president for layaway.

The good Samaritans seem to be visiting mainly Kmart stores, though a Wal-Mart spokesman said a few of his stores in Joplin, Mo., and Chicago have also seen some layaway accounts paid off.

Kmart representatives say they did nothing to instigate the secret Santas or spread word of the generosity. But it's happening as the company struggles to compete with chains such as Wal-Mart and Target.

Kmart may be the focus of layaway generosity, Yala said, because it is one of the few large discount stores that has offered layaway year-round for about four decades.

In Missoula, Mont., a man spent more than $1,200 to pay down the balances of six customers whose layaway orders were about to be returned to a Kmart store's inventory because of late payments.