Officials in Russia's Far East say a passenger plane has crashed, killing all 48 passengers and crew on board. The Angara Airlines flight disappeared from radar earlier Thursday, and emergency officials say searchers later found the burning wreckage of the plane on a hillside south of its planned destination in the town of Tynda, more than 7,000 kilometers (4,350 miles) east of Moscow. Regional Gov. Vasily Orlov said in a statement that all 48 people aboard were dead, and announced three days of mourning in the Amur region over what he called a “terrible tragedy.” It wasn’t immediately clear what caused the crash, though Russia media cited bad weather at the time.