A knife attack early on Saturday in the Gare de Lyon rail station in Paris left three people wounded, police said.
Police said they had arrested the suspected attacker.
Two of the victims suffered light wounds, while the third was more seriously hurt but was not in a life-threatening situation, police added.
The suspected assailant's motive was not immediately clear.

Bomb threats on flights cause disruption in Europe, no devices found
Greenland parliament ratifies security deal agreed with Trump
US carries out 'defensive' strikes on Iran's Qeshm Island, officials say
Kenya discharges five Ebola patients, no new cases reported
Bomb threats reported on two passenger planes to Warsaw, both land