Indonesia has raised the danger alert level for the Anak Krakatau volcano and has re-routed all flights just days after the erupting volcano triggered a tsunami that killed more than 420 people.
The volcano’s alert level has been raised to the second-highest and a three-mile exclusion zone has been imposed around the island.
More than 128 people are still missing. Residents have been told to stay away from the coast.
A crater collapse on the volcanic island at high tide on Saturday sent waves up to five metres (16ft) high smashing into the coast on the Sunda Strait, between the islands of Java and Bali.
The tsunami struck without warning and heavy rain and high seas have hampered rescue searches.
Authorities have warned that the crater of Anak Krakatau remains fragile, raising fears of another collapse and tsunami.
There are also fears of a bigger eruption and many residents are already refusing to return to their communities over fears of another tsunami.
Indonesia’s air traffic control agency AirNav said: "All flights are rerouted due to Krakatau volcano ash on red alert."
No airports have been closed.
