Over 2,200 of these are considered to be sufficiently radicalized to potentially carry out terrorist attacks, according to the broadcaster.
The news comes as a shooting occurred at the Avenue des Champs-Elysees in the French capital on April 20, leading to the death of one police officer. Two other police officers and a woman who was passing by were injured, according to Paris Prosecutor Francois Molins. The attacker was neutralized by police. According to media reports, French police pursue Belgian leads of a possible Paris shooting suspect.
Belgium has become one of Europe's most terror-prone countries over recent years amid a wave of terrorist attacks across the continent.
The country's security services have been investigating several cases related to terror attacks in Paris in 2015 and Brussels bombings in 2016, as well as foiled terror plots in the country. Belgian authorities have kept a high terror alert since March last year.
