NEW YORK, March 7 (Reuters) - Fitch Ratings on Friday cut its ratings on Washington Mutual Inc (WM.N: Quote, Profile, Research), and said it may cut Bank of America Corp (BAC.N: Quote, Profile, Research) and Citigroup (C.N: Quote, Profile, Research), due to their exposures to residential mortgages.

Fitch cut WaMu's ratings two notches to "BBB," the second lowest investment grade, from "A-minus." Bank of America and Citigroup's "AA" ratings, the third highest investment grade, were placed on review for downgrade.

(Reporting by Karen Brettell;)