An explosion has detonated at a Metro station in Brussels, International media reported.
Maalbeek Metro Station is in central Brussels and is situated near the headquarters of the European Union. Eye witnesses have reported being evacuated after the station filled with smoke.
Photos posted to social media appear to show people running out of the station and into the adjoining street, surrounded by smoke.
Alexandre Brans was in the Metro when the blast happened. He told AP: "The metro was leaving Maelbeek subway station when there was a really loud explosion. It was panic everywhere. There were a lot of people in the metro."
Metro company STIB announced on Twitter that all Metro stations are now closed.
The blast follows two explosions at Zaventem Airport in Brussels this morning shortly before 8am local time (7am GMT). At least one person has died and several others are seriously injured.