A villager watches as Mount Sinabung volcano erupts, in Kuta Tengah village, Karo Regency in Indonesia's North Sumatra April 1, 2015. The Indonesian volcano was dormant for 400 years before erupting in 2010. (Photo by Y. T. Haryono/Reuters)

Mount Sinabung volcano erupts, as seen from Mount Gundaling, Karo Regency in Indonesia's North Sumatra province April 1, 2015 in this photo taken by Antara Foto. (Photo by Endro Lewa/Reuters/Antara Foto)

A villager watches as Mount Sinabung releases pyroclastic flows seen from Tiga Serangkai, North Sumatra, Indonesia, Wednesday, April 1, 2015. Mount Sinabung, among about 130 active volcanoes in Indonesia, has sporadically erupted since 2010 after being dormant for more then 400 years. (Photo by Binsar Bakkara/AP Photo)

Mount Sinabung releases pyroclastic flows seen from Tiga Serangkai, North Sumatra, Indonesia, Wednesday, April 1, 2015. (Photo by Binsar Bakkara/AP Photo)

A villager runs as Mount Sinabung erupts at Sigarang-Garang village in Karo district, February 1, 2014. (Photo by S. Aditya/Reuters)

A woman in a village in Karo regency watches Mount Sinabung erupt in Indonesia's North Sumatra province, October 8, 2014. (Photo by Y. T. Haryono/Reuters)

Mount Sinabung volcano erupts, as seen from Tiga Pancur village, October 8, 2014. (Photo by Y. T. Haryono/Reuters)

Ash-covered motorcycles are pictured as rescue team members walk through ash during rescue operations after the Mount Sinabung eruption at Suka Meriah village in Karo, February 2, 2014. (Photo by Tarmizy Harva/Reuters)

A long exposure photo shows star trails as Mount Sinabung volcano spews hot lava as seen from Jraya village in Karo district, January 9, 2014. (Photo by Y. T. Haryono/Reuters)

Pyroclastic flow glows red during the eruption of Mount Sinabung near Sigarang Garang village in Karo district, January 19, 2014. (Photo by Reuters/Beawiharta)

Workers harvest cabbage as Mount Sinabung spews ash at Jraya village in Karo district, February 5, 2014. (Photo by Reuters/Beawiharta)

Mount Sinabung is seen during an eruption from Naman Teran village in Karo district, January 20, 2014. (Photo by Reuters/Beawiharta)

Hot lava from Mount Sinabung volcano hits trees as seen from Berastepu village in Karo district, January 8, 2014. (Photo by Reuters/Beawiharta)

A man looks at Mount Sinabung spewing ash from Jraya village in Karo district, January 13, 2014. (Photo by Roni Bintang/Reuters)

A woman looks on as Mount Sinabung spews ash, as pictured from Sibintun village in Karo district, November 18, 2013. (Photo by Roni Bintang/Reuters)

Mount Sinabung spews ash as seen from Jraya village in Karo district, January 13, 2014. (Photo by Reuters/Beawiharta)

A hibiscus flower is seen on an ash-covered plant at Mardingding village in Karo district, November 19, 2013. (Photo by Roni Bintang/Reuters)

A man holds his son while walking on dried corn with Mount Sinabung spewing ash in the background at Sibintun village in Karo district, November 25, 2013. (Photo by Reuters/Beawiharta)

Lightning strikes as Mount Sinabung volcano spews ash and hot lava, at Simpang Empat village in Karo district, September 18, 2013. (Photo by Y. T. Haryono/Reuters)

A mother holds her child as Mount Sinabung spews ash and hot lava during an eruption in Perteguhan village in Karo district, September 17, 2013. (Photo by Roni Bintang/Reuters)

Mount Sinabung spews ash as seen from Tiga Pancur village in Karo district, November 25, 2013. (Photo by Roni Bintang/Reuters)

Mount Sinabung volcano spews smoke in Suka Nalu village in the district of Tanah Karo, August 30, 2010. (Photo by Tarmizy Harva/Reuters)