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In page Leopold III of Belgium:

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On 2 August 1940, several ministers conferred in Le Perthus in France near the Spanish border. Prime Minister Pierlot and Foreign Minister Spaak were persuaded to go to London, but they were able to start out for London only at the end of August and could travel only via neutral Spain and Portugal. When they reached Spain, they were arrested and detained by the regime of Francisco Franco; they finally arrived in London on 22 October.[citation needed]