On Monday Nato started a 12-week staged move into its new state-of-the-art headquarters in Haren, on the Boulevard Leopold III heading to Brussels airport.
The international organisation is leaving behind its old site in Evere which it has occupied since 1967.
Moving 4,000 staff should be completed for mid-June.
A formal inauguration will take place during the Nato summit which is planned for 11-12 July.
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