Oil tanker was seized while on its way to Yemeni port of Aden . Three Yemeni marines were wounded , two pirates died in the operation . Piracy is a major problem in the waters off Somalia . Somalia has not had a stable government in place since independence .
Oil tanker was seized Sunday on its way to Yemeni port of Aden . Three Yemeni marines were wounded , two pirates killed in the operation . Piracy is a major problem in the waters off Somalia . Somalia has not had a stable government in place since 1991 .