A gunman opened fire with an automatic weapon on a high-speed train traveling from Amsterdam to Paris Friday, wounding three people, two of them critically, officials said.
The suspect was arrested after the train stopped in Arras, 115 miles (185 kilometers north of Paris, Interior Ministry spokesman Pierre-Henri Brandet said on French television BFM. Passengers were evacuated and police have secured the area.
Investigators from France's special anti-terror police are leading the investigation, a spokeswoman for the Paris prosecutor's office said.
Two of the victims were in critical condition, according to a statement from the office of President Francois Hollande.
The suspect is a 26-year-old Moroccan, said Sliman Hamzi, an official with police union Alliance, said on French television i-Tele.
Christophe Piednoel, a spokesman for national railway operator SNCF, said the suspect was armed with an automatic rifle and a knife.
France's interior minister Bernard Cazeneuve was en route to Arras.