MOSCOW -- U.S. warnings that terrorists might try to smuggle explosives aboard Russia-bound flights have added to fears of attacks ahead of Friday's opening of the
An estimated 40,000 security troops have been stationed around the Olympic venues in Sochi in what Russian President
In Moscow, extra security is visible at airports and hotels, but screening remains sporadic. European and U.S. passengers arriving on a flight from London to
The vast majority of foreign travelers to Sochi transit through Moscow as only two European flights, from Turkey and Germany, offer direct service to the Olympic venue.
Meanwhile, Russian news media reported that a key suspect in the twin suicide
Chechens, Dagestanis and other Islamic communities that have chafed under Russian domination of the North Caucasus region for centuries have been agitating for an autonomous state in the mountainous area between the Caspian and Black seas.
Chechen warlord Doku Umarov vowed last summer to disrupt the Olympics to embarrass Putin, who has made the $50-billion-plus investment in the Sochi games a cornerstone of his efforts to project the image of a powerful new Russia.
Although U.S. officials have urged Americans to be vigilant if traveling to Russia, they haven't altered travel guidelines.
"If we should receive information in the coming days and weeks that changes our assessment of whether people should travel to Sochi, we will make that information public," National Security Council spokeswoman Laura Magnuson said.
Secretary of State
"I believe that anybody who wants to go to the Olympics, which is just a great event, should go," he told CNN.