Two men whose clothes are covered by ash spewed from Mount Sinabung, ride a motorbike 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)