Interior Minister Bernard Cazeneuve said he met the French actor Jean-Hugues Anglade who sounded the alarm during the Thalys train shooting.
The actor, who starred in the films Killing Zoe and Betty Blue, was lightly injured when he broke the glass to activate the train's alarm.
"My thoughts are with the wounded and with the passengers who are in a state of shock," Mr Cazeneuve said.
A 26-year-old he man of Moroccan origin was arrested on suspicion of opening fire on passengers before he was subdued by two American passengers, one of whom is in a critical condition.
A source told AFP was carrying several weapons in his luggage, including guns and razor blades, with some reports that he was armed with a Kalashnikov.
The gunman foiled from carrying out a suspected terror attack on a high-speed train was armed with 270 rifle bullets and a bottle of petrol.
Three Americans and a British grandfather who foiled a suspected terror attack on a high-speed train have received France's highest honour.
Three men who overpowered a gunman on a high-speed train in France have spoken about the dramatic moment.