The suspect, who was arrested on Thursday, also had a YouTube playlist with two movies about the Columbine shooting.
French media reported on Thursday citing regional authorities that the 17-year-old most likely suffers from psychological problems.
France's Grasse prosecutor confirmed on Thursday that the shooting was not a terrorist act.
The Columbine High School shooting occurred on April 20, 1999 when two of the school’s senior students killed 12 students and one teacher, injuring over 20 others. The attackers then committed suicide.
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