Eurostar trains to London and all trains heading to northern France were brought to a halt Friday following the discovery of an unexploded World War II era bomb on tracks leading to the nation’s busiest station.

The discovery of an unexploded World War II-era bomb near the tracks severed Paris' high-speed rail links with London and Brussels on Friday, dashing travelers' weekend getaway plans and causing cascading disruptions to scores of other trains to and from France’s busiest railway station,

All 32 trains scheduled to run between London and Paris on Friday have been cancelled, wrecking travel plans for thousands of passengers. But extra services have been added to Saturday's timetable.