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They say mistreatment in north korean jails is not uncommon. >> we know that they apply very brutal treatment, torture, beating, rape to their own people and also to foreigners who are held in custody. >> all of a sudden he was thrown into this hell hole. so anything is possible. he could have suffered shock when he was sentenced to hard labor. he could have been beaten. he could have tried to take his own life. whatever the circumstances, it is likely the result of the fact that the north koreans put him in this situation. >> reporter: there are key questions still unanswered after warmbier's...

In a vegetative state for at least 14 months. while there is surprise that north korea would allow an american to be held in such condition, they said mistreatment in north korean jails is not uncommon. >> we know they provide torture, beating, rape to their own people and also held in custody. >> he was thrown in this hell hole, so anything is possible. he could have suffered shock when he was sentenced to hard labor. ebl he could have been beaten. he could have tried to take his own life. whatever the circumstances, it is likely the result of the fact that the north koreans put him in this s...

>> there are key questions still unanswered tonight after warmbier's delgt. why did kim's regime keep warmbier's condition a secret for so long? >> perhaps they waited, hoping that he would come out of the coma. he didn't. eventually they panicked. >> and how might the united states retaliate for the death of this 22-year-old university of virginia student who the north koreans had sentenced to hard labor for allegedly pulling down a propaganda banner in a hotel? >> the one reason to be careful about military retaliation is the fact that north korea now has missiles and nuclear weapons that co...

So anything is possible. he could have suffered shock when he was sentenced to hard labor. he could have been beaten. he could have tried to take his own life. whatever the circumstances, it is likely the result of the fact that the north koreans put him in this situation. >> another key question, why did kim's regime keep the condition a secret for so long. >> perhaps they waited, hoping he would come out of the coma. he didn't. eventually they panicked. >> pressed by cnn, u.s. officials are not commenting tonight on how they might retaliate for the return of a 22-year-old american in this co...