NEW : Gunmen take their own hostages . He did n't release any details on the pirates , only saying they are `` criminals . '' Attack on German - flagged ship takes place just off Bonny Island . One man is wounded in the attack . Pirates had abandoned ship .
NEW : Gunmen take their own hostages . Attack on German - flagged ship takes place just off Bonny Island . One man is wounded in the attack . Pirates had abandoned ship .