Prosecutor Francois Molins said today the decision to open an investigation was based on the actions by 26-year-old Moroccan suspect Ayoub El-Khazzani on the train Friday night and information from other European authorities about his travels and apparent radical links.
Molins said El-Khazzani notably watched the online video on his phone minutes before he walked through the Amsterdam- to-Paris train carrying an assault rifle and other weapons.
Authorities say that they found the suspect's phone in a bag left in the train. El-Khazzani boarded the train on Friday at a Brussels station.
Now that the formal investigation is opened, investigating magistrates are expected to file numerous charges against El-Khazzani, including an attempted terrorism-related attack.
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El-Khazzani was found to have an AKM assault rifle with 270 rounds of ammunition, a 9mm handgun, a box-cutter and a bottle of gasoline, the prosecutor said.
El-Khazzani had travelled through several European countries and had been repeatedly incarcerated in Spain, Molins said. He may have tried to go to Syria.