Protesters call for the return of Alan Gross
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Is Alan Gross the key to a US-Cuba thaw?

It has been exactly five years since Cuba arrested the American government contractor Alan Gross, dashing hopes amongst anti-embargo advocates that President Barack Obama would make a bold move on Cuba policy.

Since then the political climate between the two countries has improved, but this case remains an obstacle to improved ties.

Barbara Plett Usher reports from Havana.