MOSCOW - Islamist rebels from the Russian Caucasus who are fighting alongside Al-Qaeda-linked jihadists in Syria could pose a serious security threat to the 2014 Sochi Winter Olympics, analysts say.
Russia has pulled out all the stops to host the Olympic Games, its first major international sports event.
But experts fear that the return of war-hardened rebels from Syria may make it difficult to secure Sochi, which is close to the restive Caucasus region, during the high-profile event.
"Fighters from Russia are acquiring urban warfare experience in Syria. If they come back to Russia and get organised, it will be extremely dangerous," said Grigory Shvedov, the editor-in-chief of www.kavkaz-uzel.ru web magazine.
Despite the security measures which the Russian government is taking to protect the Olympic venue, Shvedov told AFP that "Sochi is quite vulnerable... to an attack by groups trained in urban battles in Syria."
In July, fears of an attack intensified when Islamist warlord Doku Umarov called on militants to stage attacks against the February Games.
In a video, he said jihadists must "exert maximum efforts" to prevent the high-profile international event from going ahead in Sochi, a city nestled between the Black Sea and the Caucasus mountains.
"If fighters from Syria come back (to Russia) and take up Umarov's call, this is a serious cause for concern," Shvedov said.