The United States has no doubt that ISIS was involved in the terrorist attack on a concert in the suburbs of Moscow on the evening of 22 March and had warned Russia in advance of the threat of such a terrorist attack.
Details: A US official, who commented on condition of anonymity, said that the United States had intelligence that confirmed ISIS's claims of responsibility for the attack and has no reason to question this statement.
The source also said that the United States had informed Moscow in advance that it had intelligence about the alleged preparation of the attack.
CBS News noted that it had also received confirmation of this from National Security Council spokeswoman Adrienne Watson, without specifying whether it was both of the above statements or one of them.
Later, the Russian news agency TASS reported that a "source in the Russian secret services" had also confirmed that the United States had warned Moscow about the terrorist threat.
Earlier, the White House said that there was no evidence of any involvement by Ukraine in the attack.
For reference: A few hours after the attack on the Crocus City Hall, reports emerged claiming that the Islamic State terrorist group had claimed responsibility for the attack.
Initially, the media doubted this claim, but CBS, CNN and The New York Times, citing US intelligence, emphasised that the country does not doubt ISIS's involvement in the attack.
The NYT, in particular, reports that it involves an ISIS unit based in Afghanistan, which is purportedly seeking revenge against Russia for its actions in Afghanistan, Chechnya, and Syria.
A shooting incident occurred prior to a concert by the band Piknik at the Crocus City Hall in Krasnogorsk, Moscow Oblast, on the evening of 22 March. Afterwards, a large fire broke out in the auditorium. On the morning of 23 March, reports said over 90 people had been killed.
On 8 March, the US Embassy in Russia and the UK Foreign Office warned of possible terrorist attacks in Moscow in the next two days.
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