MOSCOW - Russia's security agencies will undoubtedly look into a video released on Thursday by Islamic State that threatens attacks in Russia, Kremlin spokesman Dmitry Peskov said on Thursday. 'I do not know the authenticity of this video, I do not know the authenticity of these sources, but in any case no doubt this will be material for review by our special (security) services,' Peskov told journalists on a conference call. Al-Hayat Media Center, Islamic State's foreign language media division, released a Russian language video with chants of 'Soon, very soon, the blood will spill like an ocean'.