France's rail service was plunged into chaos hours before the Olympics were scheduled to start in Paris after several rail lines were set on fire.
SNCF, the state-owned railway company, said it suffered a "massive attack aimed at paralysing the network" after high-speed rail lines experienced "coordinated malicious acts" over the night.
Around 800,000 customers are expected to be affected by the disruption, which is touted to continue throughout the weekend and could potentially cause issues for those attending the Olympic opening ceremony and events.
Queues have been seen across France as well as in London's St Pancras International Station, where Eurostar services depart en route to Paris.
Eurostar said services into the French capital are being diverted and delayed as a result of the attack, with journey times increased by 90 minutes due to the damage to the line between Paris and Lille.
Trains between London and Paris are said to still be running on "classic" lines but will still experience a one-hour delay.