NEW : The Pompei , a Belgian - built ship , was one of two vessels attacked . NEW : Islands where attack occurred are roughly 100 miles off Somali coast . Dutch naval forces killed seven pirates and freed two captive fishermen . Pirates were disarmed and released because crew lacked strength to hold them .
NEW : The Pompei , a Belgian-registered ship , was one of two vessels attacked . NEW : Islands where attack occurred are roughly 800 miles off Somali coast . Dutch naval forces captured seven pirates and freed 20 captive fishermen . Pirates were disarmed and freed because crew lacked jurisdiction to hold them .