Thousands were forced to flee their homes as Mount Sinabung, in northern Sumatra, began erupting over recent days. The volcano, which had been dormant for 400 years before a 2010 eruption, began erupting again on June 2. This video was uploaded on June 19 and filmed at the foot of Mount Sinabung, displaying a pyroclastic flow (a fast-moving current of hot gas and rock) hurtling down the mountainside. Credit: YouTube/Earth Uncut TV