LONDON (Standard&Poor's CreditWire) July 4, 2000—-Following the affirmation of the ratings on the United Mexican States, Standard&Poor's today affirmed the ratings and outlook on a number of Mexican sovereign-supported issuers. These are as follows: -- Banco Nacional de Comercio Exterior, S.N.C. -- Banco Nacional de Obras y Servicios Publicos, S.N.C. -- Petroleos Mexicanos (PEMEX)) For a full list of ratings, please see RatingsDirect, Standard&Poor's Web-based credit analysis system, or telephone the ratings desk on (44) 20-7826-3540. —- CreditWire.