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.

Wells Fargo & Co. suspended travel to China after one of its top trade financing bankers was blocked from leaving the country, the latest case of authorities imposing exit bans on staff of foreign firms.

A leading multinational corporation suspended all travel to China on Thursday following allegations that one of its employees was detained