"Putin Ignored US Warnings as ISIS Claims Responsibility for Deadly Moscow Concert Hall Attack"

Gunmen attacked a concert hall in Moscow, killing 40 people and injuring over 100. The US had issued a security alert about a potential terror attack in Moscow earlier this month, which Russian President Vladimir Putin dismissed as "blackmail" just days before the attack. The US embassy has issued another alert following the incident, and it is unclear if the attack is related to the previous threats. The Russian foreign ministry has condemned the attack, expressing sympathies with the victims' families.