Russia expressed skepticism about the United States’ claims that the Islamic State was behind a gun attack on a concert hall outside Moscow, which resulted in 137 deaths and 182 injuries. The attack, occurring just before a performance by the rock group Picnic, was the deadliest in Russia in two decades. Four men, including at least one Tajik, were detained on terrorism charges. Despite the Islamic State claiming responsibility and the U.S. believing this claim, Russian President Vladimir Putin has not linked the group to the attack, instead suggesting the attackers were trying to flee to Ukraine. The U.S. had warned Russia about an imminent attack earlier in the month. Russia questioned the U.S.’s assertion of Islamic State’s involvement, hinting at a potential diversion to cover for Kyiv. The U.S. maintains intelligence confirming Islamic State’s responsibility. Putin mentioned the detention of 11 individuals, including the suspected gunmen. Videos of the suspects’ interrogations appeared on social media, showing signs of mistreatment. Following the attack, France raised its terror alert to the highest level.