Opponents argued that backing the agreement would result in additional cuts to public spending and cause economic hardship for Irishcitizens who have already been living with austerity for years.
European Commission president Romano Prodi, repeating thoughts he had after the Irish No to Nice, remarked that the Swedish vote demonstrated the need to bring Europe closer to its citizens.
Ireland's foreign minister said there are reports that an Irish citizen is involved, but the office of the French president has refused to comment on reports that French citizens are among the hostages.