The 32-year-old woman was held for alleged fraud against the company, London City Police said. Sage, a U.K. provider of accounting and payroll software, began notifying customers about the breach last week. It’s still unclear what information, if any, may have been leaked. Sage said the breach had come from unauthorized access to internal login data. Security experts say the breach underscores the danger of data theft from company insiders. About 45 percent of companies say they are ill-equipped to handle malicious threats from insiders.”]