Emergency services were called to the headquarters of the European Commission in the European Union (EU) after a suspicious white substance was found near the office of President Ursula von der Leyen.
Crews in hazmat suits have been seen outside the Brussels building, though the situation is said to be "under control" and the building is not being evacuated.
The building, known as 'The Berlaymont' houses the European Commisssion, the executive branch of the EU.