Russians Lower Flags, Lay Flowers to Honor Concert Hall Attack Victims

MOSCOW—Russia lowered flags to half-mast on Sunday for a day of mourning after terrorists killed scores of people at a concert outside Moscow in the deadliest attack inside Russia for two decades. President Vladimir Putin declared a national day of mourning after pledging to punish all those behind the attack on Friday evening, in which 137 people were killed, including three children, and 182 were injured. Over 100 people remained in hospital, some of them in a serious condition. Video footage showed a sombre-looking Mr. Putin lighting a candle at a church at his residence outside Moscow on Sunday evening to honor those who died....