MOSCOW, March 25 — Russia lowered flags to half-mast for a day of mourning and charged four men it accused of gunning down scores of people at a concert outside Moscow on Friday night in the deadliest attack inside Russia for two decades.

MOSCOW, March 24 — As a result of the terrorist attack at the Crocus City Hall concert venue outside Moscow, 152 people were injured, including five children, the Russian Emergencies Ministry for the Moscow Region said on Sunday.