In a video posted on a well-known jihadi forum, two men believed to have been suicide bombers in last month's deadly bombings in Volgograd speak of them -- and warned of more.
"We've prepared a present for you and all tourists who'll come over," the video says in part.
"If you hold the Olympics, you'll get a present from us for the Muslim blood that's been spilled."
The US-based SITE Monitoring Service identified the men as "purported Volgograd bombers Suleiman and Abdul Rahman."
December suicide bombings at a railway station and on a trolleybus in the southern Russian city -- which investigators have linked to suspects from the mostly Muslim republic of Dagestan -- killed 34 and injured dozens.
Islamist insurgents based in North Caucasus republics such as Dagestan who are seeking their own independent state have vowed to disrupt the Sochi Games in order to undermine Russian President Vladimir Putin.
