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"Weapons licences are issued too quickly," she told Austria's ORF TV.

A delivery worker who drove his vehicle at the attacker helped prevent more injuries, the police spokesman told ORF, Austria's national broadcaster.

Police have not ruled out a second attacker being involved, ORF added.

Any motive or link between the knifeman and five victims are not yet known, though ORF reported extremism police had been drafted in to investigate.

A cell transcribes the ORF sequence into messenger RNA, which travels to cellular factories called ribosomes that assemble amino acid sequences into proteins.