Starting this weekend, Belgian authorities said, patrols of the high-speed Thalys rail line as well as checks and patrols at international train stations would be intensified. Baggage checks were also set to be reinforced.
Armed with a Kalashnikov assault rifle, an automatic pistol, nine cartridge clips and a box-cutter, an attacker opened fire on board a Thalys train just after it crossed from Belgium into France last evening.
He was overpowered by a group of passengers, including two American servicemen, but not before he wounded two people who authorities said were expected to survive.
Belgium's Prime Minister Charles Michel and French President Francois Hollande spoke yesterday and agreed to step up cooperation on security matters between their two countries.
If the suspect's identity is confirmed - he is believed to be a 26-year-old Moroccan national - Spanish authorities informed Belgium of his interest in the Islamist extremist milieu and its ideas. He is thought to have lived in Belgium in 2015.