The reports, based on Flemish language dailies De Morgen and Het Laaste Nieuws, said Bilal Hadfi had been a student at the Annessens-Funck school before going to Syria in February.
Hadfi blew himself up outside the French national stadium in northern Paris during the November 13 attacks which left 130 people dead.
The Belga news agency said documents cited in the reports showed that Hadfi's teachers had become concerned at his increasingly radical views, especially his comments over the January attack on French satirical magazine Charlie Hebdo.
While Hadfi's name appeared on a list of suspects compiled by Belgium's anti-terror watchdog, the school's warning only came to light after the attacks, the reports said.
The police are now trying to establish how that happened as they the search for suspects, included the most wanted, Brussels-born Salah Abdeslam who fled back to the Belgian capital after the attacks.
On Thursday, the authorities charged a ninth person in connection with the attacks.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
