By Luc Cohen NEW YORK (Reuters) -Alleged drug cartel boss Rafael Caro Quintero, who spent decades in prison in Mexico for the murder of a U.S. drug enforcement agent, pleaded not guilty in a U.S. court on Friday to drug trafficking charges that could result in his execution.

NEW YORK — Cartel leaders Rafael Caro Quintero and Vicente Carrillo Fuentes are set to be arraigned in a U.S. federal court in New York City on Friday, following their surprise transfer from Mexico. The pair were among 29 Mexican prisoners sent Thursday to eight cities across the U.S.