Gunmen carried out a bloody attack on the "Crocus" concert hall in the suburb of Krasnogorsk, northwest of the Russian capital, Moscow. At least 143 people were killed and more than 152 others were injured in one of the worst attacks the country has witnessed in decades.
Five men wearing military uniform entered the concert hall and opened fire on those inside. The Islamic State claimed responsibility for the attack, according to accounts on social media sites that the organization usually uses.