Police says alleged suicide bombers from Dagestan militant group -- state news agency . The men were killed in a shootout with police, police say. Russia has been trying to address security concerns before the Winter Olympics . Russia is pouring resources into ensuring that the Olympic Games , seen as a flagship project of President Vladimir Putin , go off without problems . Security fears have been heightened since Volgograd bombings last month .
Police says alleged suicide bombers from Dagestan militant group -- state news agency . The men were killed in a shootout with police, police say. Russia has been trying to address security concerns before the Winter Olympics . Security fears have been heightened since Volgograd bombings last month .