Niels Caignau, flight watcher at Swissport, told Radio 1 that he heard an explosion at around 8:00 a.m. local time.
“The windows outside the departure hall are completely shattered. Many people have run out with tears in [their] eyes. We were advised to stay indoors.”
Rail traffic to the airport has been suspended, Reuters reports.
Belgian media say there are several injured people in the Brussels Airport departure hall and rail traffic to the airport has been suspended.
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No planes are landing at Brussels Airport which is in lockdown, and planes are being diverted to Antwerp. Planes are circling over the city of Liege.
Sky News Middle East correspondent Alex Rossi, who was at the airport en route to Tel Aviv, has tweeted that he could “feel the buildings move.”