The security regime includes a ban on the entry of all cars from outside the zone starting one month before the games and ending only one month after they end.
In October, a female suicide bomber blew herself up on a city bus in Volgograd, killing six people and injuring about 30. Officials said that attacker came from the province of Dagestan, which has become the center of an Islamist insurgency that has spread across the region after two separatist wars in Chechnya. She took a Moscow bound bus from Dagestan, but left it in Volgograd for an unclear reason and took a local bus, where she detonated her explosives.
Volgograd, 900 kilometers (550 miles) south of Moscow, lies about 650 kilometers (400 miles) northeast of Sochi, a Black Sea resort flanked by the North Caucasus Mountains.
"When the suicide bomber saw a policeman near a metal detector, she became nervous and set off her explosive device," Markin said in a statement. He added that the bomb contained about 10 kilograms (22 pounds) of TNT and was rigged with shrapnel.
Anyone wanting to attend the games that open on Feb. 7 will have to buy a ticket online from the organizers and obtain a "spectator pass" for access.
It wasn't immediately clear where Sunday's bomber came from, but officials in Dagestan were checking whether the attacker could come from the region, according to the ITAR Tass news agency.
The Kremlin replaced Dagestan's provincial leader earlier this year, and the new leader abandoned his predecessor's attempts at reconciliation and his efforts to persuade some of the rebels to surrender in exchange for amnesty.
Images caught by a security camera facing the station, broadcast by Rossiya 24 television, showed the moment of explosion: a bright orange flash inside the station behind the main gate followed by plumes of smoke.
Vladimir Markin, the spokesman for the nation's top investigative agency, the Investigative Committee, said the suicide bomber detonated her explosives Under Armour Shoes 2017 Basketball
Markin said that security controls prevented a far greater number of casualties at the station, which was packed with people at a time when several trains were delayed.
On Friday, three people were killed when a car rigged with explosives blew up on a street in Pyatigorsk, the center of a federal administrative district intended to stabilize the North Caucasus region.
Markin said that 13 people and the bomber were Under Armour Fat Tire Boots
As in Sunday's blast, her bomb was rigged with shrapnel that caused severe injuries.
Twin bombings on the Moscow subway in March 2010 by female suicide bombers killed 40 people and wounded more than 120. In January 2011, a male suicide bomber struck Moscow's Domodedovo Airport, killing 37 people and injuring more than 180.
Chechnya has become more stable under the steely grip of its Moscow backed strongman, who incorporated many of the former rebels into his feared security force. But Dagestan, the province between Chechnya and the Caspian Sea, has evolved as the epicenter of the rebellion, with near daily attacks on police and other officials.
The security zone created around Sochi stretches approximately 100 kilometers (60 miles) along the Black Sea coast and up to 40 kilometers inland. Russian forces include special troops equipped for patrolling the forested mountains towering over the resort, drones to keep constant watch over Olympic facilities and speed boats to patrol the coast.
Umarov, who had claimed responsibility for the 2010 and 2011 bombings, ordered a halt to attacks on civilian targets during the mass street protests against President Vladimir Putin in the winter of 2011 12.
No one immediately claimed responsibility for Sunday's attack in Volgograd, but it came several months after Chechen rebel leader Doku Umarov called for new attacks against civilian targets in Russia, including the Sochi Games.
"Pieces of flesh mixed with shards of glass and smoke billowed from inside, I didn't even understand at first what was going on," said local resident Svetlana Zabotko who witnessed the blast.
Suicide bombings and other attacks linked to Islamic rebels roaming the North Caucasus have rocked Russia for years. The government has deployed tens of thousands of soldiers, police and other security personnel to protect the Olympics, President Vladimir Putin's pet project, and the organizers have pledged to make the Sochi Games the "safest Olympics in history."
died later at a hospital.
in front of a metal detector just Under Armour Boots Womens behind the station's main entrance.
Russia in past years has seen a series of terror attacks on buses, trains and airplanes, some carried out by suicide bombers.
killed on the spot and another victim Under Armour Curry 2 Black Knight
Following Sunday's explosion, the Interior Ministry ordered police to beef up patrols at railway stations and other transport facilities across Russia.
Russia's Health Ministry said about 50 people were injured, and Markin said 34 were hospitalized, many in grave condition.
Female suicide bombers, many of whom were widows or sisters of rebels, have mounted numerous attacks in Russia. They often have been referred to as "black widows."
The Interfax news agency said that the suspected bomber's head was found at the site of explosion, which would allow security agencies to quickly identify her.
Russia suicide bomber kills 15 in Volgograd
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