North Korean officials , meanwhile , asked for Panama to release the cargo ship and let the crew go . NEW : Captain , arrested on weapons possession charges . Investigators have emptied only one of the cargo holds on the ship . They have found military weapons in shipping containers . Cubans believe the equipment was destined for North Korea for repair .
NEW : Captain , arrested on weapons possession charges . Investigators have emptied only one of the cargo holds on the ship . They have found military weapons in shipping containers . Cubans believe the equipment was destined for North Korea for repair .