updated 3/24/2011 1:38:23 PM ET 2011-03-24T17:38:23

The European Union is investigating a targeted cyber attack against some EU officials and its diplomatic service and says it took unprecedented precautions over the hacking.

EU spokesman Antony Gravili said Thursday the threat to the EU computer system was taken seriously because the attack, which was spotted Tuesday, was very targeted. He refused to elaborate.

He says some passwords had to be changed, mail from outside had to be restricted and access to the EU's intranet from outside had to be limited.

It is not the first cyber attack the EU has faced, but because of the nature of the threat, the EU had never taken precautionary action on such a scale.

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