A bribery scandal involving the retail giant Wal-Mart could be widening from Mexico to multiple other countries, the company reported Thursday. The New York Times had previously revealed how Wal-Mart paid Mexican officials millions of dollars in bribes to win construction permits in Mexico. Now the company says it has uncovered enough evidence to merit bribery concerns about its business practices in China, India and Brazil. The news comes as hundreds of Wal-Mart workers walked off the job this week to protest low wages, poor benefits and alleged retaliation from management. Workers have promised a wave of strikes and protests next week culminating in a massive day of action on Black Friday, the biggest shopping day of the year.