WASHINGTON - The Obama administration on Thursday called on Cuba to immediately release jailed American contractor Alan Gross, saying his health has worsened and he can no longer walk.

State Department spokeswoman Victoria Nuland said the administration also is urging authorities in Havana to turn over information about his condition to his family so they can assess his health and whether he is receiving adequate medical care.

"He has lost more than 100 pounds since his arrest. He suffers from severe degenerative arthritis and is no longer able to walk in his cell. He has other health problems that cause pain and require treatment," Nuland said.

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