Key EU officials rushed back to their Brussels headquarters at short notice today and called emergency meetings to discuss how they can help the United States .
NATO also called an urgent meeting of ambassadors from its 19 members to discuss the security implications of the attacks. European allies expressed their solidarity with the United States.
At EU and NATO headquarters, all flags flew at half-mast.
EU officials said the foreign ministers of the 15 member states will meet early tomorrow morning to look at how Europe could offer aid to the United States in coping with the attacks and investigate who was behind them as well as assess the political implications.
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The European Commission will also meet in an emergency session.
AP