The French government investigated after multiple telecommunications lines were by acts of vandalism as cities around France host events for the 2024 Paris Olympics.
Organisers for the Paris Games say their operations were not affected by the incident on Monday.
France’s second largest telecommunications company said it had made repairs in several areas already or workarounds kept the scale of the impact low.
Des dégradations commises dans plusieurs départements cette nuit ont affecté nos opérateurs de télécommunications.
Elles ont des conséquences, localisées, sur l’accès à la fibre, la téléphonie fixe et la téléphonie mobile.
Sous ma supervision, le centre pour les communications…— Marina Ferrari (@Marina_Ferrari) July 29, 2024
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Some other providers also got things back up and running later on Monday.
The vandalism came after arson attacks hit train networks around France on Friday, hours before the Olympics opening ceremony.
A national investigation has been launched into the attacks on optic cables and “the damage to the telecommunications systems,” according to Paris prosecutors.
The crimes they are investigating include damaging property with an intent to harm vital national interests and attacking data processing systems by an organised group, which carry 10 to 15-year prison sentences.
Marina Ferrari, secretary of state in charge of digital affairs, posted on X, formerly Twitter, that damage in several regions overnight Sunday to Monday affected telecommunications operators.
She said that led to local impact on access to fibre lines and fixed and mobile telephone lines.
A French police official said there were issues in at least six of the country’s administrative departments, which include the region around the Mediterranean city of Marseille, hosting Olympic soccer and sailing competitions.
Paris 2024 organisers said they have been informed of acts of sabotage on fibre optic networks across several French departments but “we can only confirm that there is no impact on our operations”.
SFR, France’s second-largest telecommunications company, said its long-distance network “was the target of acts of vandalism at five points in five departments between 1am and 3am”.
“Maintenance teams are on site to carry out repair work,” SFR said in a statement.
It added that the impact of the vandalism acts on its customers was “very low because there are sufficient backups and workarounds”.
Up to eight French and international operators, who use SFR’s infrastructure, have been affected, the company also said, adding that full service has already been restored by Monday afternoon in several areas.
Telecom operators Bouygues and Free confirmed they were affected.
Free later said service had been restored after an “incident effecting multiple networks in 11 departments”.
A national investigation is also under way into last week’s train sabotage, which disrupted travel for nearly a million passengers in France as well as people in London and in other neighbouring countries.
Train traffic had largely resumed by Monday.
French media reported that an extreme-left activist was arrested at a rail facility on Sunday in the Seine-Maritime region of western France.
But the Paris prosecutor’s office said it was unconnected to what happened Friday and that no one has been arrested so far in the national investigation into the arson attacks.
