NEW : Gunmen release their One hostages . Attack on Nigerian -flagged ship takes place Friday off the Niger Delta . Lagos , Nigeria ( CNN ) -- Nigerian gunmen on Sunday released 12 sailors who ship was attacked two days earlier off the country 's coast , a spokesman for the Nigerian military said . 12 sailor is wounded in the attack . Antigha had abandoned ship .
NEW : Gunmen release their One hostages . Attack on Nigerian -flagged ship takes place Friday off the Niger Delta . 12 sailor is wounded in the attack . Antigha had abandoned ship .