Police requested a media blackout while they carried out the raids. Just after 10.30pm the operation was confirmed to have ended with the state prosecutor due to give a press briefing on what had happened.
Earlier, the Belgian government said it faced a serious and imminent Paris-style attack. Brussels remains on maximum alert level with its metro, universities, and schools all remaining shut today.
Prime minister Charles Michel told a news conference: “What we fear is an attack similar to the one in Paris, with several individuals who could possibly launch several attacks at the same time in multiple locations.”
Belgian interior minister Jan Jambon said several suspects linked to the Paris attacks were thought to be at large, and the threat would not necessarily disappear if Salah Abdeslam, believed to have played a key role in the attacks, was found.
Meanwhile, French police issued a fresh appeal to identify the third man involved in the attacks at the national stadium on November 13.
The Department of Foreign Affairs has warned Irish people going to Brussels to exercise extreme caution and avoid public events.
European Affairs Minister Dara Murphy said security has been stepped up at Ireland’s embassy in Brussels