Paris police evacuated the Gare de l'Est train station on Friday after a bomb threat, as authorities across Europe pressed on with efforts to prevent new violence after the January 7 attack on the satirical newspaper Charlie Hebdo's offices in the French capital.
The Paris prosecutor's office, meanwhile, said 10 people were arrested in anti-terrorism raids in the region, targeting people linked to a gunman who attacked a kosher supermarket and claimed ties to the Islamic State group.
The developments come on the day that US Secretary of State John Kerry arrived in Paris and a day after Belgian police killed two suspected militants in a firefight and arrested a third man.
A French police official said the Gare de l'Est station was closed as a precaution.
The official, who was not authorised to be publicly named, would not give further details.
Gare de l'Est, one of several main stations in Paris, serves cities in eastern France and countries to the east.