Wells Fargo has suspended all travel to China after a banker was blocked from leaving the country, a source said, bringing the U.S. bank's operations in the world's second-largest economy into focus.

China has prevented a Wells Fargo banker from leaving the country, the American bank said, adding to concerns about travel there as tensions with Washington remain high. A Wells Fargo spokesperson said the bank was “closely tracking this situation and working through the appropriate channels so our employee can return to the United States as soon as possible”.

A U.S.-based Wells Fargo banker who works in trade financing has been blocked from leaving China after traveling there recently, people familiar with the matter said.Chenyue Mao, a Shanghai-born and Atlanta-based managing director at Wells Fargo,