Under level 4, the number of major public events will be reduced, and police and military presence remain high. A lot of police effort will be focused on public transport, rail stations, shopping streets and other places with big crowds.

Mr Michel announced that schools in the Brussels-Capital region will remain closed on Tuesday, but will re-open from Wednesday. The Brussels metro will also remain closed on Tuesday and will re-open “gradually” from Wednesday.

Mr Michel thanked the Belgian population for their serenity in the face of the crisis. The Prime Minister also thanked the security services for their work in the face of the heightened terror threat.