Other key statements:
Devices placed under bridge in Bryansk and Kursk regions on railway are of Ukrainian origin.
Total of 388 passengers were on train that collided with bridge in Bryansk region, 122 people injured and 7 died.
Investigation of terrorist attacks in Kursk, Bryansk regions continues, perpetrators, organizers is being sought.
Late on Saturday, an overpass collapsed on a Moscow-bound passenger train near the city of Bryansk, leaving seven people dead. Russian train operator Moscow Railways said the locomotive and carriages were derailed by the falling bridge. Governor Alexander Bogomaz said that the bridge was blown up while the train was moving.
Locations of 3 explosive devices with capacity of 15 kilograms of TNT on bridge in Bryansk region identified, Investigative Committee Chairman Alexander Bastrykin said.