Just hours before the Olympic games kicked off, US officials warn that terrorists may try to get explosives on airplanes in tubes of toothpaste.
ABC's Hamish McDonald is in Moscow with the latest.
The focus should now be on competition, but in Sochi security is still the issue.
Athletes from the US have arrived safely, along with their competition from around the world.
The concern is keeping the remaining arrivals safe, too.
Airlines sending international flights into Russia have been told by US security officials that militants may try to smuggle explosives on board, inside tubes of toothpaste.
Rep. Michael McCaul (R) is Chairman of House Homeland Security.
"I believe it's very specific and credible information."
A security "ring of steel" has been built around these Olympics venues. And for good reason.
In December, suicide bombers killed 34 people north east of Sochi, in Volgograd.
Militants have been fighting a long running insurgency in the Caucuses region and are threatening more attacks during the games.
Matthew Olsen is Director of National Counterterrorism.
"There are a number of specific threats with varying degrees of credibility that we're tracking."
There are already restrictions on carrying liquids and creams on flights. There's a long history now of airline bomb plots, with ever-changing tactics.
For the organizers of these games, sport is the least of their worries.
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