The suspect was arrested at home, in the Olivais neighborhood, and documents proving his intentions were seized during the raids, RTP channel reported.
The source pointed out that the young man would cause explosions at the Faculty of Sciences and then, amid chaos, he would act with knives and machetes.
Everything so far indicates that the man was acting alone and he is not part of any criminal organization.
Calm has been restored among students, while the detainee is awaiting the final result of the investigation in preventive detention.
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