One month before the Winter Olympics begin in the Russian resort town of Sochi -- and in the shadow of last month's deadly bombings in Volgograd -- a huge security operation has swung into gear. 

A special exclusion zone went into force Tuesday under which only Sochi-marked vehicles, emergency or specially accredited intelligence service cars will be allowed into the wider Sochi area. 

Air traffic and sea access will be restricted, and everyone going into the zone will have to go through heavy security and identity checks. 

Russia is pouring huge resources into ensuring that the Games, seen as a flagship project of President Vladimir Putin, go off without incident. 

Two bombings in 24 hours last month in Volgograd, one targeting the city's main train station and the second a trolley bus, raised concerns of a potential threat to the Sochi event. 

No group has to date claimed responsibility for the attacks, but suspicion has fallen on Chechen separatist groups. 

A bitter battle for an independent Chechnya, lasting almost two decades, spawned an insurgency that has spilled into neighboring republics in the North Caucasus region, including Dagestan. 

Chechen warlord Doku Umarov, leader of the Islamist Caucasus Emirate group, last summer called on his followers to do what they can to disrupt the Games. He claims they will be held on the graves of Muslim occupants of Sochi, who he says were driven out by Russian imperial forces in the 19th century. 

Despite the shockwaves of the Volgograd attack, International Olympic Committee President Thomas Bach said he was confident that Russia would keep the Winter Olympics safe. 
What event is upcoming?
Which organization runs it?
Who is in charge of that group?
What's his position?
Where are the Olympics being held?
Which is in what country?
Is it an urban location?
Who is the leader of Russia?
How many bombings were there?
How much time passed between them?
Where were the explosions?
In what city?
Has anyone been arrested?
Who is thought to have done it?
How long has the struggle in Chechnya gone on?
What region are they in?
Who is a leader in the struggle?
What organization is he in?
Is he in charge of that?
Who used to live in Sochi?
the Winter Olympics
the Winter Olympics begin
International Olympic Committee
International Olympic Committee
Thomas Bach
President Thomas Bach
Committee President
Committee President 
Sochi
town of Sochi
Russia
Russian resort town of Sochi
no
 resort town of Sochi
Vladimir Putin
President Vladimir Putin
Two bombings
Two bombings in 24 hours 
24 hours
24 hours
one targeting the city's main train station and the second a trolley bus
one targeting the city's main train station and the second a trolley bus
in Volgograd

Two bombings in 24 hours last month in Volgograd, one targeting the city's main train station and the second a trolley bus, raised concerns of a potential threat to the Sochi event. 
No
No group has to date claimed responsibility for the attacks, but suspicion has fallen on Chechen separatist groups. 
Chechen separatist groups
but suspicion has fallen on Chechen separatist groups
almost two decades
A bitter battle for an independent Chechnya, lasting almost two decades
the North Caucasus region
the North Caucasus region
Doku Umarov
Chechen warlord Doku Umarov
the Islamist Caucasus Emirate group
leader of the Islamist Caucasus Emirate group
yes
leader of the Islamist 
Muslim occupants
Muslim occupants of Sochi