A White House National Security Council spokesperson told Sputnik that the United States recently shared information with Russian authorities regarding a planned terrorist attack against Russia, in accordance with its so-called duty to warn policy.
"Earlier this month, the US Government had information about a planned terrorist attack in Moscow – potentially targeting large gatherings, to include concerts – which prompted the State Department to issue a public advisory to Americans in Russia," the spokesperson said. "The US Government also shared this information with Russian authorities in accordance with its longstanding ‘duty to warn’ policy."
Emergency and security services are responding to the crisis. Russia's Investigative Committee opened a criminal case into the terrorist attack. According to the Russian Federal Security Service (FSB) and Russia's Investigative Committee, at least 133 people were killed and more than 120 others were injured.