FILE PHOTO: A Wells Fargo bank sign is pictured in downtown Los Angeles, California, U.S. August 10, 2017. REUTERS/Mike Blake/File Photo

(Reuters) - Wells Fargo & Co WFC.N, the third-largest U.S. bank by assets, has fired four foreign-exchange bankers amid an investigation into that business by both the bank and regulators, the Wall Street Journal reported, citing people familiar with the matter and the bank.

The foreign-exchange investigation now shows there is also trouble in Wells Fargo's investment-banking arm, the WSJ reported. (on.wsj.com/2yCUaNF)

Wells Fargo did not respond immediately to a Reuters request for comment.