At the time of the evacuation, the Belgian royal couple and Grand Duke Henri were in the Krieps hall for a presentation on the space sector. Attendees then heard a message sounded via speakers, telling them to leave the building.

The photos published on this site are subject to copyright and may not be copied, modified, or sold without the prior permission of the owner of the site in question.

After a few minutes, it transpired that it had been a false alarm and the royals were able to return to the presentation on Wednesday afternoon.