The interview came as the international community paid tribute to victims of Tuesday's deadly terror attacks in the Belgium capital Brussels.
Leman, who is also chairman of Foyer, an organization that works to integrate minorities in Molenbeek municipality in Brussels, specifically drew attention to the sites of the terrorist attacks.
"What strikes me is that the terrorists deliberately decided to target international places in Brussels. The Maalbeek metro station is located very close to Schuman Square, which represents European institutions. So one can safely say that the terrorist tried to hit European symbols," he said.
Leman also described Daesh as a mafia-style terrorist group, whose Tuesday attacks came like a bolt from the blue for Brussels police.
"I think that the police were not prepared for this kind of criminality. What I see is that even Belgium's entire justice system is now unable to fight such mafia-like structures and organizations as Daesh," he said.
On March 22, at least 31 people were killed and 270 more injured in two bomb blasts in Brussels Airport and an explosion at the Maalbeek metro station in central Brussels.
The Eiffel Tower in Paris, the Brandenburg Gate in Germany and the Trevi fountain in Rome have been lit up in the colors of Belgian flag to show solidarity with the Belgians. Other European and non-European countries are supporting this campaign.
Right after the attacks took place, hundreds of people went to Bourse Plaza to leave a message of condolence and support, despite the fact that authorities asked everybody to stay inside.