A far-left group has claimed responsibility for the Paris arson attacks that crippled the country's rail network just hours before the opening ceremony of the Olympics. Just hours before the grand procession on the River Seine on Friday night, fires were started at key facilities, bringing trains to a halt and affecting around 800,000 passengers - including athletes and spectators heading to the Games. Preliminary evidence in the investigation showed that strategic points of the network were targeted, indicating that the perpetrators had a detailed knowledge of the network, according to investigators. France's intelligence services and police have been scrambling...