Podcast Summary: Les Clés, “Aux sources des attentats de Bruxelles, avec Frédéric Van Leeuw”

Host: Arnaud Ruyssen (RTBF)
Guest: Frédéric Van Leeuw, ex-procureur fédéral, procureur général de Bruxelles
Date: March 18, 2026

Overview of the Episode

This special episode commemorates the tenth anniversary of the March 22, 2016 Brussels attacks, offering a critical look back at the roots and developments leading to the tragedy. Through in-depth conversation with Frédéric Van Leeuw—prosecutor at the center of the crisis—the podcast retraces how Belgium, and Europe more broadly, became a target for jihadist terrorism, the evolution and tactics of radical networks, the aftermath and lessons drawn for society, and the enduring impact on victims and institutions.

Key Discussion Points & Insights

1. The Geopolitical Roots of ISIS and European Radicalization

[01:29–04:02]

• The fall of Saddam Hussein in 2003 led to chaos and the emergence of armed Sunni groups, notably Al-Qaida in Iraq, later becoming ISIS/Daesh.
• The “cocktail explosif” of former Iraqi officers and jihadists, especially after time spent together in prison, fostered a new, more powerful movement.
• ISIS capitalized on chaos in Syria to create a de facto terrorist state, proclaiming itself in 2014 and calling for global jihad.

2. Why Did European Youth Leave for Syria?

[04:02–06:07]

• Frédéric Van Leeuw highlights globalization, social media, and a generational search for meaning as key factors:
  • “On est au début des médias sociaux… 30% de toute la production sur internet est faite par 1% de personnes très radicalisées… qui ont touché nos jeunes.” (04:02)
• Family and societal mechanisms of identity formation and transmission became weaker; radical content filled the gap.
• Quote: "J’aime bien cette phrase de Vaclav Havel : le problème des hommes d’aujourd’hui, ce n’est pas qu’ils ne trouvent pas de sens à leur vie mais que ça les dérange de moins en moins." (05:00)

3. Sharia for Belgium & the Legal Gray Zone

[06:07–07:11]

• Sharia for Belgium played a key role in recruitment. Belgian and European authorities were initially unsure how to legally respond.
• Inspiration from UK’s Sharia for England—prosecuting such groups was delayed across Europe in the name of safeguarding freedoms.

4. The “Returnees” — A New Threat

[08:10–09:15]

• The Jewish Museum shooting by Médi Mouche (2014) exposed the dangers posed by returnees from Syria.
• Many left with “humanitarian” ideals, but came back “complètement déstructurés par la guerre” with potential for extreme violence.

5. ISIS’s Global Jihad Strategy

[11:36–12:53]

• Referencing Al-Souri’s writings, Van Leeuw explains a strategy to radicalize Muslim minorities in the West and provoke polarization and destabilization.

6. Escalation Across Europe: From Brussels to Paris

[13:06–14:29]

• After early attacks (Jewish Museum, Charlie Hebdo, Hyper Casher), Belgian authorities uncovered plots (Verviers cell) showing increased organization.
• Van Leeuw describes: “On est un peu tombés des nues… il y avait un soutien dans la population locale, qui était importante, dans la petite délinquance…” (15:03)

7. Evolving Threats & Intelligence Gaps

[15:03–18:13]

• The Islamic State’s tactics shifted: returnees spent less time in Syria and blended back undetected, using Europe’s migrant crisis to mask movements.
• Example: Salah Abdeslam’s transnational travels to collect cell members.
• Growing use of encrypted communications complicated investigations, with agencies overwhelmed by information overload (“un sapin de Noël” where lights—leads—flash everywhere). (18:58)

8. The Paris and Brussels Connections

[20:11–22:13]

• November 13, 2015: the Paris attacks shocked Europe, with part of the network linked to Belgium.
• Van Leeuw reflects:
  • “On n’est pas nécessairement étonné que ça se passe, mais que ça se passe avec une telle ampleur, oui.” (21:41)

9. The Spread of Fear and the Challenge of “Soft Targets”

[22:55–23:52]

• Terrorist focus on “soft targets” (public places, mass casualties) created both a practical and psychological challenge for authorities.
• Van Leeuw: “La cible peut changer en fonction des opportunités. L’important étant de choquer la population.” (23:52)

10. Molenbeek’s Role & Social Exclusion

[25:18–26:31]

• Molenbeek became stigmatized as a “base arrière” of terrorism, but Van Leeuw stresses the need for nuance.
• “Peut-être que ça, effectivement, c’était un terreau important. … Mais… il y a des gens extraordinaires qui habitent à Molenbeek… il faut nuancer les choses.” (25:18)

11. The Hunt for Salah Abdeslam

[26:56–30:55]

• Breakthroughs came by linking terror suspects to a document forger, unraveling hidden networks.
• Abdeslam’s arrest was nearly derailed by media leaks, forcing an accelerated and risky operation to avoid wider casualties.

12. Lead-up to the Brussels Attacks

[31:34–33:47]

• Publication of photos of the El Bakraoui brothers (without consulting investigators) pushed them to accelerate their plot.
• Internal debates occurred about whether to release identities to the public.

13. March 22, 2016: Chaos and Its Aftermath

[34:04–38:17]

• Coordinated attacks at Zaventem Airport and Maelbeek Metro cause 35 deaths, 350 injuries, massive disruption.
• Van Leeuw describes the day as "la gestion du chaos"—focusing on immediate crisis management over reflection.
• Moving anecdote of the emotional toll on police families:
  • "Sa fille lui avait dit, tu sais, tu peux me dire que papa est décédé. … Ça montre l’impact que ça a eu sur tout le monde." (35:50)
• Aftermath: Both victims and first responders suffered trauma; institutional support was insufficient.

14. Society, Cohesion, and the Success or Failure of the Terrorists’ Project

[39:09–39:46]

• Van Leeuw highlights that, unlike France, Belgium avoided extreme polarization between Muslims and non-Muslims:
  • “… mon analyse personnelle est que la Belgique a été beaucoup moins polarisée que la France par rapport au clivage voulu par El Adnani… on a réussi à garder une cohésion dans notre population.” (39:09)

15. Ongoing Risk of Radicalization

[40:10–40:56]

• Radicalization now continues online, across new divides:
  • “On n’a pas encore trouvé … la solution … de ce qu’est cette radicalisation sur internet et ce que les algorithmes servent à nos jeunes mais aussi à nos moins jeunes. … Je trouve qu’on n’en est pas encore assez conscient.” (40:10)

16. Final Reflection and Societal Lesson

[41:13–41:58]

• True prevention requires attentiveness to fragility in society:
  • “Ces attentats nous ont appris à peut-être être plus attentifs à la fragilité. … Si on est là pour les personnes les plus fragiles, pour les victimes, à ce moment-là, on peut avancer et éviter justement la polarisation.” (41:13)

Notable Quotes & Memorable Moments

• On the role of youth radicalization:
  "On est quelque part cinq ans après l’invention de l’iPhone… les réseaux sociaux commencent à toucher directement les personnes sans filtre… 1% de personnes très radicalisées… ont touché nos jeunes." (Frédéric Van Leeuw, 04:02)
• On feeling overwhelmed by intelligence:
  "On est un peu confronté à un sapin de Noël avec des lumières qui s’allument et qui s’éteignent partout... on est noyé dans les informations." (18:58)
• On social cohesion after the attacks:
  "La Belgique a été beaucoup moins polarisée que la France... on a réussi à garder une cohésion dans notre population." (39:09)
• On fragility and societal responsibility:
  "Quand on est plus attentif aux personnes vraiment fragiles, on est plus humain. … c’est pour leur rappeler... qu’il faut faire attention aux personnes les plus fragiles..." (41:13)

Timestamps for Major Segments

• [01:29] Geopolitical roots of ISIS; emergence in Iraq and Syria
• [04:02] Factors in European youth radicalization—social media, identity, and search for meaning
• [06:07] Sharia for Belgium and first prosecutions
• [08:10] Jewish Museum attack reveals “returnees” threat
• [11:36] ISIS’s global jihad strategy
• [13:50] Verviers cell: first signs of organized cells in Belgium
• [18:58] “Sapin de Noël”: Overwhelming data and encrypted communication
• [20:11] Paris attacks—connection to Belgium
• [22:55] “Soft targets” and changing terror tactics
• [25:18] Nuances around Molenbeek and youth exclusion
• [26:56] Breakthrough in the Abdeslam investigation
• [31:34] Impact of photo leaks on plot acceleration
• [34:04] Brussels attacks: sequence and initial response
• [39:09] Belgian vs. French societal response
• [40:10] Continued radicalization and digital threats
• [41:13] The importance of supporting the fragile to counter future risks

Conclusion

Through a careful blend of historical context, investigative detail, and reflection, this episode provides a comprehensive, sobering look at the forces that led to the Brussels attacks, the complexity of the threat, its impact on Belgian society, and the ongoing, evolving risk of radicalization. Frédéric Van Leeuw’s testimony reminds listeners of the human, institutional, and societal challenges that remain—and the vital importance of caring for the most vulnerable as a bulwark against future violence.