The case was not been referred to France's counterterrorism prosecutors. The officials said he lived near the university. Two were taken to a hospital with injuries that were considered serious, but not life-threatening.
All three of the victims, one woman and two men, are said to be in their early 20s.
The police officials requested anonymity because they were not allowed to speak publicly about an ongoing investigation. All three are thought to be of Chinese origin.
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