Mount Sinabung unleashes powerful burst of volcanic ash

Mount Sinabung, seen releasing pyroclastic flows, or tephra, on Saturday, June 13, 2015, was put on it highest alert level last week.

A farmer tends to his field as Mount Sinabung releases pyroclastic flows in Tiga Pancur, North Sumatra, Indonesia on Saturday, June 13, 2015.

This picture taken June 12, 2015 shows a lava dome seen at the crater of Mount Sinabung volcano in the Karo district of the North Sumatra province in Indonesia. Nearly 3,000 people have been evacuated from their homes after Indonesia upgraded the threat posed by the volcano to the highest possible level, an official said on June 4, 2015.

Residents load their belongings on a vehicle during an evacuation in a village in Karo district while Mount Sinabung volcano is partly seen at left background.

Residents are evacuated on farm vehicles at a village in the district of Karo near Mount Sinabung volcano, seen in the background, partly covered by clouds on June 3, 2015. Indonesian authorities ordered evacuation of residents close to the volcano as Mount Sinabung increased activity. Following the February 2014 powerful eruption that displaced about 3,500 residents, Mount Sinabung volcano located in Sumatra island remains active.

Villagers sit inside a temporary shelter after they evacuated their homes on the slope of Mount Sinabung on Wednesday, June 3, 2015. Anyone living within a 7-mile radius south and southeast of the crater was ordered to evacuate following the raised alert status of the 2,600-meter (8,530-foot) -high volcano.

This picture taken on June 10, 2015 shows Mount Sinabung spilling hot lava in the Karo district in North Sumatra province.