The attack took place about four nautical miles off Bonny Island , said Lt. Col. NEW : Gunmen release their 12 hostages . The gunmen are said to have demanded the release of a number of militants who were being held in an undisclosed location by the militants. One sailor is wounded in the attack . Pirates had abandoned ship .
NEW : Gunmen release their 12 hostages . The gunmen are said to have demanded the release of a number of militants who were being held in an undisclosed location by the militants. One sailor is wounded in the attack . Pirates had abandoned ship .