Belgian soldiers 'neutralised' a person at a main Brussels railway station amid media reports of explosion-like noises there, authorities said.

Belgium's Crisis Centre, which monitors security threats in the country, said via Twitter that 'soldiers had to neutralise an individual' at the Central station on Tuesday.

Brussels prosecutor's office spokeswoman Ine Van Wymersch told VRT network there was a small explosion at the station, one of the nation's busiest, but the damage was limited.

Ms Van Wymersch said authorities were on the scene quickly and a person was shot.

She said at first sight no one else appears to have been wounded.

Photos posted on social media showed a small fire in the station, which was evacuated along with the main Brussels square.

Broadcaster RTL quoted Fires Services spokesman Pierre Meys confirming that some kind of an explosion had happened in the city's Central station on Tuesday.

Mr Meys could not say what had caused the blast.

He could only confirm that firefighters were at the scene.

Brussels police said via Twitter that there was 'an incident with an individual at the station. The situation is under control'.

They asked the public to follow police instructions.

There appear to be no civilian injuries or deaths, Belgian prosecutors said.

The Belgian capital's Grand Place, a major tourist site, was evacuated along with the station about 200 metres away.

Belgium has been on high alert since suicide bombers killed 32 people on the Brussels subway and at an airport on March 22 last year.