Two young men who took the blame for the recent string of bombing attacks in the Russian city of Volgograd also threatened to leave a "present" at next month's Olympic Games in a video released today.
"We've prepared a present for you and all tourists who'll come over," they said in the video, which CNN reports was posted on a well-known Jihadi forum. "If you will hold the Olympics, you'll get a present from us for the Muslim blood that's been spilled."
The men, who are believed to have carried out the Volgograd attacks, are dressed in black and standing in front of a black banner with a religious verse that has been associated with al Qaeda-linked extremists.
The threat was released the same day that an interview with President Vladimir Putin was broadcast, in which he promises to keep Olympic visitors safe.
"We will try to make certain that the security measures are not intrusive or too conspicuous, so they are not too noticeable for the athletes, the Olympics' guests or journalists," Putin said. "But at the same time, we will do our utmost to ensure that they are effective."
More than 30 people were killed in last month's back-to-back bombings, which took place in a train station and on a trolleybus.