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By Diego Ore and Brian Ellsworth CARACAS (Reuters) - Venezuelan President Nicolas Maduro said on Saturday his government had captured Americans, including a pilot, involved in espionage activities and said U.S. citizens in the future will have to seek visas to come to the OPEC nation. Speaking during a rally, he said his government will prohibit some U.S. officials from entering Venezuela in retaliation for a similar measure by the government of President Barack Obama against a group of Venezuelan public officials. A spokesman for the U.S. embassy in Caracas said he was unable to comment, citing a lack of any official diplomatic communication with the Venezuelan government. Pereira said the group had been coming to Venezuela for 14 years and denied the missionaries were involved in espionage.