A 23-year-old man randomly attacked five people in Villach, a city in southern Austria, on Saturday, police said.
A 14-year-old was killed and four others injured.
A man was detained by police in connection with the attack. He is a Syrian national with legal residence in Austria, police said.
A 42-year old man who works for a food delivery company witnessed the incident from his car. He drove towards the man and helped to prevent things from getting worse, police spokesman Rainer Dionisio told Austria’s public broadcaster ORF.
Police said it was not clear whether the man acted on his own and therefore they were searching for potential further suspects.
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