A blaze set by angry workers at an electronics factory in Mexico last Friday was the work of a disgruntled former employee, Foxconn says. The fire was set in an activities center on the factory campus early Feb. 19 by employees that had ended their night shift and were waiting for buses to take them home. Foxconn denies this charge, and labor groups in Mexico could not be reached for comment. The Taiwanese company is the world’s largest contract electronics manufacturer and employs over half a million workers around the world.”]