MEXICO CITY (AP) — The U.S. Embassy in Mexico issued a security message Friday warning U.S. citizens to avoid the Pacific resort of Acapulco because of violence and protests. In yet another blow to a coastal city once favored by U.S. movie stars and jet-setters in the 1950s and '60s, the embassy said its personnel "have been instructed to defer non-essential travel to Acapulco, by air or land," and added that it "cautions U.S.