A bipartisan group of U.S. Senators has sent a letter to Cuban President Raul Castro urging the release of an American contractor jailed in Cuba for nearly three years, saying his detention is "a major obstacle" to improving relations.
The letter, signed by 44 senators, is the strongest appeal yet by members of Congress in the case of Alan Gross, who is serving a 15-year sentence for illegally setting up Internet networks in Cuba.
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