Austrian authorities have identified the perpetrator in Monday night’s attack as an Austrian-born 20-year-old named Fejzulai Kujtim, according to state news agency APA.
Kujtim was from the Vienna suburb of Moedling.
Austria's Interior Minister Karl Nehammer said at a Tuesday news conference that the attacker had served time in prison after being convicted of trying to travel to Syria to fight for ISIS as a teenager.
He was sentenced in April 2019 to 22 months in jail, but freed eight months later on December 5, as he was considered a young adult and therefore eligible for conditional release.
Speaking at the news conference, Nehammer said there will be further questions about the deradicalization program the attacker went through.
Correction: A previous version of this post incorrectly stated what part of Austria Fejzulai Kujtim was from. He was from Moedling, a suburb of Vienna.