A series of arson attacks on the TGV / SNCF routes took place on 26th July 2024, causing significant disruption for several days just before the Olympic Games started in Paris. Investigators have said the attacks appeared to be co-ordinated sabotage, "terrorism" has not been officially mentioned and as far as I know [28thJuly] no-one has claimed "responsibility" - although several suspects come to mind !
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this is from www.bbc.co.uk/news/articles/c28eyr3y18yo part of the fairly extensive BBC coverage.
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