Last contact with the Yemeni freighter was late last week . Dozens of ships have been attacked by pirates in the Gulf of Aden . But he added that he does n't have `` any evidence that pirates have links to al Qaeda . '' Comment: No ransom figure yet for hijacked Saudi supertanker . Pirates seized the Sirius Star on November 15 .
Last contact with the Yemeni freighter was late last week . Dozens of ships have been attacked by pirates in the Gulf of Aden . Comment: No ransom figure yet for hijacked Saudi supertanker . Pirates seized the Sirius Star on November 15 .