The detained man, whose nationality was not revealed, went on a stabbing spree at around 8:00 am (0700 GMT) at the station, which serves domestic trains as well as those heading to Switzerland and Italy, AFP reported.
One person suffered serious injuries while two others were lightly wounded, police said.
“The suspect did not cry out (any religious slogans) during his attack,” a police source said. “He presented the police an Italian driving license.”
The area between halls one and three were temporarily inaccessible, rail operator SNCF said on X, formerly Twitter.