In Russia, an explosion hit a rail line in Caucasian region of Dagestan early on Monday. The Interfax news agency reported quoting police officials that the railway line was hit by an explosion before a train travelling from Tyumen to Azerbaijan's capital Baku passed.<br/><br/>The train did not derail, although the locomotive dragged the wagons some 150 meters along the damaged rails. No casualties were reported. The attack follows the Friday bombing of an elite passenger train bound from Moscow to Saint-Petersburg, which killed around 25 people.<br/><br/>Dagestan's neighbour Chechnya was the site of two bloody separatist wars after the 1991 collapse of the Soviet Union, and a low-level insurgency persists in the region despite the end of major hostilities. <br/>