"We've just got to try to find different ways to attack the zone, " he said.

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It looks more like a mutual defence pact: an attack on one euro-zone member is now an attack on all.

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"I was trying my best to attack the strike zone, " Gonzalez said.

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U.S. sources said a Special Forces helicopter crashed late Wednesday in Iraq's southern no-fly zone before the initial attack on Baghdad.

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As part of this increased security drive, the Seychelles coast guard has intensified its patrolling efforts, with fast-attack armed vessels monitoring a newly defined zone for fishing.

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But each attack stalled as it entered the Italian zone.

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The belief that big euro-zone countries could be protected from attack has been disproved.

ECONOMIST: The euro crisis

The worry for Greeks is that with Spain and Italy coming under attack in financial markets, some euro-zone members may be tempted to sacrifice Greece.

ECONOMIST: Greek bail-out

Home Office officials have said in the event of an attack, the area immediately surrounding the scene, known as the "hot zone", would have an inner and outer cordon, with mobile shower units.

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The attack coincided with an Arab League meeting that was under way inside the Green Zone, in the presence of Belgian, German and Swiss experts, to discuss the formation of an Arab parliament, as stipulated by a summit of Arab leaders held in Baghdad last year.

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