Sochi 2014: BBC reports on tight security
The opening events of the Winter Olympics are being held amid tight security in the Caucasus mountains and the Black Sea resort of Sochi.
As the sporting action gets underway, the US has warned airlines with direct flights to Russia that explosives hidden in toothpaste tubes could be smuggled onto planes.
The BBC's Daniel Sandford in Sochi says there is a large security presence in the town, at the airport and at sporting venues.
06 Feb 2014