An Atlanta-based banker working for Wells Fargo has been prevented from leaving China, the latest incident that threatens to amplify concerns among Western executives about the potential consequences of visiting the world’s second-biggest economy.

China said Monday that a US-based Wells Fargo banker has been blocked from leaving the country because she “is involved in a criminal case.” Chenyue Mao, an Atlanta-based managing director at Wells Fargo who was born in Shanghai,