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Tony Blair and Gordon Brown smiling just seconds before the projectile is launched

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During a reply to the Tory leader, Mr Blair is struck on the shoulder by a projectile filled with purple powder

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Deputy Prime Minister John Prescott looks up at the source of the disturbance in the public gallery

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Mr Blair tries to regain his composure after the purple projectile is thrown

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Speaker Michael Martin immediately suspends proceedings in the House of Commons

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MPs evacuate the Commons following the sudden breach of security during PM's questions