A resident carries a gas canister as an ash cloud hovers above during an eruption of Mount Sinabung volcano at Tiga Serangkai village in Karo Regency, North Sumatra province, Indonesia June 24, 2015. More than 10,000 people from 12 villages, who are living around the slopes of Mount Sinabung, left their homes and moved to refugee camps, local media reported. (Photo by Reuters/Beawiharta)

Residents walk on a road covered in volcanic ash from the eruption of Mount Sinabung in Brastagi, North Sumatra, Indonesia, Friday, June 26, 2015. The volcano has spewed hot lava almost daily since its alert status was raised early this month to the highest level. Thousands of villagers whose homes are in the danger zone have been evacuated since then to safer areas. (Photo by Binsar Bakkara/AP Photo)

Hot lava flows from Mount Sinabung volcano during an eruption in the danger zone area at the empty village of Bekerah in Karo Regency, North Sumatra province, Indonesia, June 25, 2015. (Photo by Reuters/Beawiharta)

A child covers his face with a plastic bag, as ash from Mounth Sinabung volcano hits the town of Brastagi, North Sumatra province, Indonesia, June 25, 2015. (Photo by Reuters/Beawiharta)

A man receives a face mask as ash from Mounth Sinabung volcano falls on the town of Brastagi, North Sumatra province, Indonesia, June 25, 2015. (Photo by Reuters/Beawiharta)

Women give out face masks to people as ash from Mounth Sinabung volcano falls on the town of Brastagi, North Sumatra province, Indonesia, June 25, 2015. (Photo by Reuters/Beawiharta)

Hot lava flows from Mount Sinabung volcano during an eruption, as seen from Tiga Serangkai village in Karo Regency, North Sumatra province, Indonesia June 26, 2015. (Photo by Reuters/Beawiharta)

A child reacts as ash spews from Mount Sinabung volcano during an eruption as seen from Kuta Tengah village in Karo Regency, North Sumatra province, Indonesia June 26, 2015. (Photo by Reuters/Beawiharta)

Hot lava flows from Mount Sinabung volcano during an eruption in the danger zone area at the empty village of Bekerah in Karo Regency, North Sumatra province, Indonesia, June 25, 2015. (Photo by Reuters/Beawiharta)

Children gather as they look at ash spewing from Mount Sinabung volcano during an eruption as seen from Kuta Tengah village in Karo Regency, North Sumatra province, Indonesia June 26, 2015. (Photo by Reuters/Beawiharta)

Villagers watch as Mount Sinabung releases volcanic material into the air in Tiga Serangkai, North Sumatra, Indonesia, Thursday, June 25, 2015. The volcano has spewed hot lava almost daily since its alert status was raised early this month to the highest level. Thousands of villagers whose homes are in the danger zone have been evacuated since then to safer areas. (Photo by Binsar Bakkara/AP Photo)

A long exposure picture shows molten lava spilling from the crater of Mount Sinabung as seen from Berastepu village in Karo, North Sumatra province, Indonesia, 24 June 2015. Thousands of villagers were evacuated following the weekend eruption of Mount Sinabung in Indonesia's North Sumatra province, with more expected to follow, officials said on 16 June. Mount Sinabung has erupted intermittently since late 2013. (Photo by Dedi Sahputra/EPA)

Residents react as ash spews form Mount Sinabung volcano during eruption at Tiga Serangkai village in Karo Regency, North Sumatra province, Indonesia June 24, 2015. (Photo by Reuters/Beawiharta)

Hot lava flows from Mount Sinabung volcano during eruption as seen from Tiga Serangkai village in Karo Regency, North Sumatra province, Indonesia June 25, 2015. (Photo by Reuters/Beawiharta)