A man is believed to have been shot by police at Brussels Central Station with reports of an attempted bomb attack.
There are reports that a person wearing an explosive belt was “neutralised” by soldiers inside the station.
The station and the city’s main square, the Grand Place have been evacuated.
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In March 2016, 32 people died in attacks on Brussels airport and the metro system which were claimed by the Islamic State (IS) group.
There are no other casualties, Reuters news agency reports.
A police spokesman told the agency: “There was an accident at Central Station. There was an explosion around a person. That person was neutralised by the soldiers that were on the scene.
“At the moment, the police are in numbers at the station and everything is under control.”
Brussels Central Station is one of three main terminals in the city.