Deadly attack on Moscow concert hall shakes Russian capital and sows doubts about security

Shocked Russians are bringing flowers and teddy bears to the Crocus City concert hall on the outskirts of Moscow to pay their respects to more than 100 people who died in a grisly attack claimed by the Islamic State group. Mourners hung flowers on fences and piled them on the ground Saturday near the concert hall where gunmen opened fire on a crowd and set off explosives that started a huge fire. Videos shared on social media showed candles being lit in memory of the dead and wounded at monuments across Russia and at Russian embassies abroad.