Ash was identified as high as 20,000 feet (6,000 meters) on the Java side of the volcano and a plume of up to 50,000 feet (15,000 meters) on the Sumatra side.

Mount Anak Krakatau has erupted since late on Friday, with volcanic ash disrupting hundreds of flights as Indonesia faces a string of natural disasters across the archipelago.

Indonesia’s Anak Krakatau volcano has erupted, causing flight cancellations at Jakarta's Soekarno-Hatta International Airport and stranding about 170,000 passengers in the region