Parents of Otto Warmbier file claim for North Korean cargo ship
The vessel was detained in May because it was carrying coal to be sold in other countries in violation of United Nations sanctions.
FILE PHOTO - Otto Frederick Warmbier attends a news conference in Pyongyang, North Korea, in this photo released by Kyodo February 29, 2016. (photo credit: KYODO/VIA REUTERS)ByMARCY OSTER/JTA