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Residents of Karo district leave as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. ADE SINUHAJI/AFP/Getty Images ( 522962385 )

Pigeons fly by as Mount Sinabung spews volcanic materials following its eruption in Karo, North Sumatra, Indonesia, Sunday, Sept. 15, 2013. Thousands of people have been evacuated from their homes after the volcano erupted early Sunday. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Erupts )

Residents of Karo district leave as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. ADE SINUHAJI/AFP/Getty Images ( 522963006 )

A woman and her daughter flee their home as Mount Sinabung erupts in Karo, North Sumatra, Indonesia, Tuesday, Sept. 17, 2013. Thousands of people were evacuated from their villages following the eruption the 2,600-meter (8,530-feet) volcano Sunday after being dormant for three years, sending thick ash into the sky with small rocks pelting neighboring villages. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Eruption )

A villager walks under heavy ashfall after a fresh eruption of Mount Sinabung volcano covered Karo district and other areas on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. KHARISMA TARIGAN/AFP/Getty Images ( 522961677 )

An Indonesian student sweeps volcanic ash from the school hallway in Karo district on September 16, 2013 while Mount Sinabung volcano (L) emits steam and ash. Thousands of villagers fled on September 15, 2013 after Sinabung erupted on Indonesia's Sumatra island spewing rocks and red-hot ash onto surrounding villages, officials said. The volcano was dormant for nearly 100 years before erupting in August and September 2010, forcing about 12,000 people to flee. KHARISMA TARIGAN/AFP/Getty Images ( 522931834 )

A giant column of ash clouds rise from the crater of the Mount Sinabung volcano during a fresh eruption on September 17, 2013, as seen from Karo district. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. KHARISMA TARIGAN/AFP/Getty Images ( 522961491 )

Residents of Karo district leave as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. ADE SINUHAJI/AFP/Getty Images ( 522962373 )

School children wear masks to protect their respiration from the volcanic ash from the eruption of Mount Sinabung, at an elementary school in Karo, North Sumatra, Indonesia, Tuesday, Sept. 17, 2013. Thousands of people were evacuated from their villages following the eruption of the 2,600-meter (8,530-feet) volcano Sunday after being dormant for three years, sending thick ash into the sky with small rocks pelting neighboring villages. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Eruption )

Residents watch from their house as Mount Sinabung erupts in Karo, North Sumatra, Indonesia, Tuesday, Sept. 17, 2013. Thousands of people were evacuated from their villages following the eruption of the 2,600-meter (8,530-feet) volcano Sunday after being dormant for three years, sending thick ash into the sky with small rocks pelting neighboring villages. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Eruption )

Villagers flee on a volcanic ash-covered road as Mount Sinabung erupts in Karo, North Sumatra, Indonesia, Tuesday, Sept. 17, 2013. Thousands of people were evacuated from their villages following the eruption of the 2,600-meter (8,530-feet) volcano Sunday after being dormant for three years, sending thick ash into the sky with small rocks pelting neighboring villages. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Eruption )

Mount Sinabung spews volcanic materials from its crater as seen from Karo, North Sumatra, Indonesia, Monday, Sept. 16, 2013. Thousands of people have been evacuated from their homes after the volcano erupted Sunday. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Eruption )

Indonesian farmers rush to harvest crops in the district of Karo as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. SUTANTA ADITYA/AFP/Getty Images ( 522968693 )

Indonesian police evacuate residents of Karo district from the erupting Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. SUTANTA ADITYA/AFP/Getty Images ( 522964137 )

Indonesian farmers rush to harvest crops in the district of Karo as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. SUTANTA ADITYA/AFP/Getty Images ( 522964134 )

Residents leave the district of Karo as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. SUTANTA ADITYA/AFP/Getty Images ( 522963122 )

Mount Sinabung spews volcanic materials into the air as it erupts in Karo, North Sumatra, Indonesia, Tuesday, Sept. 17, 2013. Thousands of people were evacuated from their villages following the eruption of the 2,600-meter (8,530-feet) volcano Sunday after being dormant for three years, sending thick ash into the sky with small rocks pelting neighboring villages. (AP Photo/Binsar Bakkara) ( APTOPIX Indonesia Volcano Eruption )

Residents leave the district of Karo as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. SUTANTA ADITYA/AFP/Getty Images ( 522963538 )

Villagers wait for evacuation on a road covered by volcanic ash from an eruption of Mount Sinabung as they flee their homes in Karo, North Sumatra, Indonesia, Sunday, Sept. 15, 2013. Thousands of people fled their homes after the volcano erupted early Sunday. (AP Photo/Binsar Bakkara) ( APTOPIX Indonesia Volcano Erupts )

An Indonesian farmer leaves with his carabao in the district of Karo as an ash cloud rises during a fresh eruption of the Mount Sinabung volcano on September 17, 2013. Thousands of villagers fled after Mount Sinabung's series of volcanic eruptions on Indonesia's Sumatra island, spewing rocks and red-hot ash onto surrounding villages, officials said. SUTANTA ADITYA/AFP/Getty Images ( 522963010 )

Villagers work on a rice field as Mount Sinabung spews volcanic materials in Karo, North Sumatra, Indonesia, Sunday, Sept. 15, 2013. Thousands of people fled their homes after the volcano erupted early Sunday. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Erupts )

A villager rides a cow cart as Mount Sinabung is seen in the background in Karo, North Sumatra, Indonesia, Monday, Sept. 16, 2013. Thousands of people have been evacuated from their homes after the volcano erupted Sunday. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Eruption )

Villagers ride motorcycles on a road covered by volcanic ash from the eruption of Mount Sinabung as they flee their homes in Karo, North Sumatra, Indonesia, Sunday, Sept. 15, 2013. Thousands of people fled their homes after the volcano erupted early Sunday. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Erupts )

Indonesian evacuees displaced by Mount Sinabung volcano eruption sleeps in cramped condition in an evacuation center in Karo district on September 16, 2013. Thousands of villagers fled on September 15, 2013 after Sinabung volcano erupted on Indonesia's Sumatra island spewing rocks and red-hot ash onto surrounding villages, officials said. The volcano was dormant for nearly 100 years before erupting in August and September 2010, forcing about 12,000 people to flee. KHARISMA TARIGAN/AFP/Getty Images ( 522930631 )

Mount Sinabung spews volcanic materials as villagers board a truck to flee their homes following its eruption in Karo, North Sumatra, Indonesia, Sunday, Sept. 15, 2013. Thousands of people have been evacuated from their homes after the volcano erupted early Sunday. (AP Photo/Binsar Bakkara) ( Indonesia Volcano Erupts )