An aerial view of Anak Krakatau volcano during an eruption at Sunda strait in South Lampung, Indonesia. Indonesia on Thursday raised the alert level for the erupting Anak Krakatau volcano to the second-highest, and ordered all flights to steer clear, days after it triggered a tsunami that killed at least 430 people. (Photo/Agencies)
Damaged buildings are seen along a beach after a tsunami in Banten province, Indonesia, Dec. 26, 2018. Indonesia on Thursday raised the alert level for the erupting Anak Krakatau volcano to the second-highest, and ordered all flights to steer clear, days after it triggered a tsunami that killed at least 430 people. (Photo/Agencies)
Damaged buildings are seen along a beach after a tsunami in Banten province, Indonesia, Dec. 26, 2018. Indonesia on Thursday raised the alert level for the erupting Anak Krakatau volcano to the second-highest, and ordered all flights to steer clear, days after it triggered a tsunami that killed at least 430 people. (Photo/Agencies)
Damaged buildings are seen along a beach after a tsunami in Banten province, Indonesia, Dec. 26, 2018. Indonesia on Thursday raised the alert level for the erupting Anak Krakatau volcano to the second-highest, and ordered all flights to steer clear, days after it triggered a tsunami that killed at least 430 people. (Photo/Agencies)