seoul south korean fish boat capsize country western coast sunday collide refuel vessel kill eight people south korea coast guard say boat carry two sailors 20 passengers collision occur water near incheon west seoul coast guard official tell media brief two people remain miss search rescue operation involve five helicopters 19 vessels underway president moon jae-in order measure take find miss office tell reporters rescue water send nearby hospitals coast guard say reason collision yet confirm accord coast guard fish boat capsize south korea eight kill