Belgian authorities confirmed yesterday they had made several arrests as they sought to prevent jihadist fighters or sympathisers with the Islamic State extremist group from carrying out attacks.
There was no visible increase in external security around the Commission headquarters in the European Union district of central Brussels early today.
"The Commission has not received any information about specific threats," a Commission spokesman said, adding that all further enquiries should be directed to the local authorities.
Dutch public broadcaster NOS said yesterday at least two people among those arrested in the Belgian operations came from The Hague.
Citing unnamed sources, NOS said one possible target was the Commission building, with the aim being to kill as many people as possible, similar to an attack in May on the Jewish museum in central Brussels which left four dead.
The main suspect in that attack is a Frenchman, Mehdi Nemmouche, who spent more than a year fighting with Islamist extremists in Syria and is now being held in Belgium on charges of "murder in a terrorist context".
Brussels is also home to NATO's headquarters and many other international companies and organisations, but security is mostly low-key and discreet.
Belgium, like several European countries, is increasingly worried about its nationals going to fight in Syria and Iraq for fear they will return home battle-hardened and even more radicalised, posing a threat to security.
It is estimated some 400 Belgians may have done so, while about 90 have returned home.
