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ISIS has released footage of the concert hall massacre that killed at least 130 people in Moscow.
The footage was taken by the men who carried out the attack.
According to United States officials, the U.S. warned Moscow that a terror attack was imminent however Putin reportedly threw cold water on the reports.
Three days before the attack, Putin denounced the warnings, saying they were just attempts to intimidate Russians.
"All that resembles open blackmail and an attempt to frighten and destabilize our society," he said.