Salanbek Dzakhiyev, 40, a resident of the North Caucasus Republic of Ingushetia, was detained in the town of Nazran on Tuesday. Two more suspects in the case, Amirkhan Khidreyev and Maksharip Khidreyev, were also detained in the city on the same day.
The Nevsky Express hurtled off the rails near Veliky Novgorod on August 13 on the country's busiest rail line, linking Moscow and St. Petersburg, following an explosion that left a crater in the tracks. Carriages were overturned and dozens of people were injured.
The blast occurred as the train was approaching a railway bridge over a road, but the train, traveling at around 190 kilometers per hour (118 mph), had sufficient momentum to make it over the bridge before running into the embankment, avoiding potentially massive fatalities.
