A bomb alert temporarily disrupted train services at Calais-Frethun station in northern France on Thursday morning, affecting both domestic and international rail travel.

Axar.az reports, citing Reuters, that train services resumed later on Thursday morning after the gendarmerie authorized their restart, national rail operator SNCF said.

The national gendarmerie did not immediately respond to an emailed request for comment.

International high-speed rail operator Eurostar said some services between London and Paris had been affected by the disruption, as trains traveling on the route pass through Calais-Frethun. The incident caused delays to services to and from London, the company said.

The alert came amid a broader wave of bomb threats and hoaxes reported in France and other European countries in recent months, targeting flights, schools and, in some cases, media organizations.

It was not immediately clear whether Thursday’s alert was linked to any of the previous threats.