A female suicide bomber detonated explosives Sunday at a train station in the southeastern city of Volgograd, killing 14 people and putting officials on alert as Russia prepares to host the Winter Olympics in Sochi.

More than 30 people were wounded, with nine of the victims listed in serious condition.

The woman detonated the bomb as people waited in line at the train station in the city formerly known as Stalingrad.

The blast occurred at 12:45 p.m. when the suicide bomber was forced to go through metal detectors at the Volgograd-1 station.

"When she saw the police in front of the metal detectors, the suicide terrorist detonated the explosives without ever entering the station," Russian Investigative Committee spokesman Vladimir Markin told Russian news agencies.

The security checkpoint established after the January 2011 attack on Moscow's Domodedovo International Airport prevented the terrorist from reaching the train station's main hall, keeping the death toll from being higher, the Russian Investigative Committee said.

The station, located across from a plaza that marks the scene of some of the bloodiest fighting in World War II, was full of travelers at the time of the attack due to delays in train service and the New Year's holiday.

President Vladimir Putin, who has taken a hardline position against Islamic terrorists, ordered planes sent to Volgograd to transport the seriously wounded to Moscow hospitals.

Indications are that the attack was staged by a member of the Islamic guerrilla groups operating in the Caucasus region, but officials have not yet said who was behind the bombing.

Investigators have recovered the head of the suicide bomber, officials said.

Russian officials fear an increase in terrorist and guerrilla attacks as the 2014 Winter Olympic Games in the Black Sea resort of Sochi approach.

The Sochi Winter Olympic Games are scheduled to begin on Feb. 7. EFE