MEXICO CITY (Reuters) - The severed heads of four men were found dumped on a Mexican street on Wednesday with a message accusing a drug gang kingpin of treachery, police said. Neighbors in the northern city of Culiacan found the men's bodies wrapped in plastic sheets and a blanket, with their heads stuffed into white plastic bags. An obscenity-laden note scrawled onto a piece of cardboard invited Joaquin "El Chapo" (Shorty) Guzman -- the head of the Sinaloa drug cartel -- "to see what his stupid acts had caused." Guzman, who is considered Mexico's most-wanted man, is battling a rival gang led by his one-time ally Arturo Beltran Leyva, whose hitmen reportedly killed one of Guzman's sons in May. In a separate incident in the same city, police said they killed four suspected drug gang members in a shootout. More than 1,600...
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