Belgium has remained on high alert following March bombings claimed by the IS in Brussels and attacks in in France and Germany, recently
It is too soon to talk about a terror attack, added a spokesman
Prime Minister Charles Michel said the nation would remain 'extremely vigilant'
The country's terror alert will remain at level 3 out of 4
Raids took place in 16 communes in Brussels, Flanders and Wallonia and passed off without incident
As a dragnet aimed at Islamic State operatives spiralled across Brussels and into at least five European countries on Friday, the authorities were also focusing on a narrower but increasingly alarming threat: the vulnerability of Belgium's nuclear installations.The investigation into this week's deadly attacks in Brussels has prompted worries that the Islamic State is seeking to attack, infiltrate or sabotage nuclear installations or obtain nuclear or radioactive material. This is especially worrying in a country with a history of security lapses at its nuclear facilities, a weak intelligence apparatus and a deeply rooted terrorist network.On Friday, the authorities stripped security badges from several workers at one of two plants where all nonessential employees had been sent home hours after the attacks at the Brussels airport and one of the city's busiest subway stations three days earlier. Video footage of a top official at another Belgian nuclear facility was discovered last year
As the faithful arrived, the Belgian and European Union flags fluttered at the entrance to the city's main mosque
Howeevr, he did not said that whether authorities would put Brussels on the highest terror alert.