The terrorists arrived to Belgium through Turkey and Libya, along with thousands of undocumented people, the 7sur7 news portal reported.
Among the four terrorists reportedly is a Palestinian who specializes in subversive activities. The other three terrorists are allegedly related to the notorious Islamic State (ISIL) militant group, according to the news outlet.
This information has not been confirmed by officials.
On November 13, a series of terrorist attacks in Paris claimed the lives of some 130 people. The ISIL claimed responsibility for the attacks. At least four of the terrorists allegedly responsible for the attacks arrived in France from Belgium, according to the French police. Law enforcement agencies have found out that one of the perpetrators, who is still at large, lived in a Brussels district with large migrant population.