Hot lava from Mount Sinabung volcano hit trees as seen from Berastepu village in Karo district, Indonesia's North Sumatra province, January 8, 2014. (Photo by Reuters/Beawiharta)

A boy wears a plastic bag to cover his face from ash following a further eruption of the Mount Sinabung on January 4, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Ash covered motorcyclists are seen as they drive on a road covered with ash following a further eruption of the Mount Sinabung on January 4, 2014 in Karo District, North Sumatra, Indonesia. The number of displaced persons has increased to 20,000 in Western Indonesia as Mount Sinabung continues to spew ash and smoke after several eruptions since September. Eleven deaths have now been recorded as a result of the eruptions with hundreds more falling ill. Officials expect the number of evacuees to rise as volcanic activity remains high. (Photo by Ulet Ifansasti/Getty Images)

A girl stands in the foreground as Mount Sinabung spews pyroclastic smoke on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

A view of tomatos covered by ash following a further eruption of the Mount Sinabung on January 6, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Villagers harvest tomatoes at their fields covered by ash following a further eruption of the Mount Sinabung on January 6, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Sinabung mount spews ash to the air during an eruption near from Karo, North Sumatra on January 7, 2014. An Indonesian volcano that has erupted relentlessly for months shot volcanic ash into the air 30 times on January 4, forcing further evacuations with more than 20,000 people now displaced, an official said. (Photo by Sutanta Aditya/AFP Photo)

A man wears a plastic bag to cover his face from ash after their village hit by ash from eruption of Mount Sinabung in Payung village on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

An ash covered man wears a mask as his village was hit by ash from eruption of Mount Sinabung in Payung village on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Sinabung mount spews ash and lava during an eruption near from Karo, North Sumatra on January 8, 2014. (Photo by Sutanta Aditya/AFP Photo)

A woman carries her son as they watch Mount Sinabung spew pyroclastic smoke on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Sinabung mount spews ash to the air during an eruption near from Karo, North Sumatra on January 7, 2014. An Indonesian volcano that has erupted relentlessly for months shot volcanic ash into the air 30 times on January 4, forcing further evacuations with more than 20,000 people now displaced, an official said. (Photo by Sutanta Aditya/AFP Photo)

Villagers panic as they look for masks as their village is hit by ash from the eruption of Mount Sinabung in Payung village on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

The village is covered by ash from the eruption of Mount Sinabung in Payung village on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Mount Sinabung spews pyroclastic smoke, seen from Sibintun village on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Villagers walk on the road as their village is hit by ash from the eruption of Mount Sinabung in Payung village on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

People watch as Mount Sinabung spews pyroclastic smoke on January 8, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

Villagers harvest tomatoes at their fields covered by ash following a further eruption of the Mount Sinabung on January 6, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

An ash covered a motorcyclist as drives on a road covered with ash following a further eruption of the Mount Sinabung on January 4, 2014 in Karo District, North Sumatra, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

In this late Sunday, January 5, 2014 photo, Mount Sinabung spews hot lava as seen from Jeraya, North Sumatra, Indonesia. The 2,600-meter (8,530-foot) volcano has sporadically erupted since September. Authorities extended a danger zone around a rumbling volcano in western Indonesia on Sunday after it spewed blistering gas farther than expected, sending panicked residents streaming down the sides of the mountain. (Photo by Binsar Bakkara/AP Photo)

A bicycle is caked with volcanic ash from the eruption of Mount Sinabung outside a house in Sibintun, North Sumatra, Indonesia, Tuesday, January 7, 2014. (Photo by Binsar Bakkara/AP Photo)

Mount Sinabung spews volcanic materials as seen from Gundaling, North Sumatra, Indonesia, Wednesday, January 8, 2014. (Photo by Binsar Bakkara/AP Photo)

A motorcycle is covered in volcanic ash from an eruption of Mount Sinabung in Tiga Pancur, North Sumatra, Indonesia, Saturday, January 4, 2014. The 2,600-meter (8,530-foot) volcano has sporadically erupted since September. (Photo by Binsar Bakkara/AP Photo)