UPDATE 10pm: Police in Rotterdam stopped a van with Spanish licence plates containing a number of gas bottles close to the venue of a concert by an American rock band that was cancelled following a threat, the mayor of the Dutch port city said.

Police in the Netherlands have detained a man on suspicion of preparing a terrorist crime after finding a Kalashnikov rifle, two full ammunition clips and a painting featuring a flag used by Islamic State at his home.

Dutch police have carried out another raid in the port city of Rotterdam, days after detaining a 32-year-old French national on suspicion of involvement in a "terrorist plan".

A 32-year-old Frenchman has been arrested in the Dutch port city of Rotterdam at the request of French authorities who suspect him of "involvement in planning a terror attack".

[Updated at 9:30] A train heading for Paris has been evacuated after a man locked himself in a toilet.

Rotterdam is presently undergoing a renaissance of sorts, specifically in the areas of arts, culture, night life and fashion.