French police are questioning Ayoub El-Kahzzani, a 25-year-old Moroccan accused of carrying out Friday’s attempted attack on a high-speed Thalys train between Amsterdam and Paris.

The suspect, who was restrained and held on the floor by passengers, is said to have links to the “radical Islamist movement”.

He can be held for four days without being charged.

Security measures aboard Thalys trains have been stepped up.

After a meeting of its national security council on Saturday, Belgium said mixed Franco-Belgian security patrols would be increased on board the Thalys trains, which link major cities in the Netherlands and Belgium to Paris.

Patrols and security checks will also be boosted at international train stations, and more baggage checks will be carried out.

The suspect boarded the Thalys train in Brussels, and Belgian prosecutors are carrying out an anti-terrorism investigation of their own.

The suspect, who is being questioned near Paris, was flagged up to French authorities by their Spanish counterparts in February 2014.

He is reported to have lived in France, Spain, and Belgium and to have traveled to Syria.