The parents of Otto Warmbier, an American college student who was imprisoned in North Korea for 17 months, describe the condition they found their son in at the airport when he arrived back in the US.

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Warmbier was detained in January 2016 at the airport in Pyongyang while on his way home. His parents say the University of Virginia student had been on a tour of the reclusive country.

North Korean authorities said they had security footage of him trying to steal a banner containing a political slogan that was hanging from the walls of his Pyongyang hotel.

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