The bombings of a train station and trolley bus in Volgograd, which killed 34 people and wounded many more, heightened security fears ahead of the Winter Olympics in Sochi.
The National Anti-Terrorism Committee said today in a statement that Magomednabi and Tagir Batirov were detained in Dagestan, a predominantly Muslim republic that has become the center of an Islamic insurgency. They are suspected of helping the suicide bombers travel to Volgograd, about 650 kilometers to the north.
