People watch the thick ash spewed from Mount Sinabung in Karo Regency, North Sumatera Province, Indonesia, on Dec. 27, 2017. Indonesian Volcanology and Geological Disaster Mitigation (PVMBG) reported that Mount Sinabung erupted here again on Wednesday, sending hot clouds of gas and ash as far as 4.6 kilometers down its slopes. (Xinhua/Lana)