Wal-Mart Stores Inc. found a higher rate of severe violations at foreign factories last year as it stepped up inspections for labor and environmental standards in more than 60 countries where it buys clothes, toys, shoes and other products, it said in a report.

Wal-Mart posted its “2005 Report on Ethical Sourcing” on a section of its Web site last week but did not make any public announcement, spokeswoman Beth Keck said.