Prime minister Elio Di Rupo has expressed his support for the Jewish community and said: "All Belgians are united," after the shooting in Brussels.
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Six people have been injured and a man has been arrested after an alleged noxious substance attack in east London.
The US first lady travelled without her husband to support the Invictus Games, which were founded by the Prince in 2014.
The Pentagon sent a group of military planes just off the state's coast in a show of force.