Indonesia has rerouted flight paths and raised the alert status of the Anak Krakatoa volcano which continued to spew large clouds of ash into the air.
A 5km exclusion zone has been set up and the volcano’s status was raised to level 3 – the second highest.
Clouds of ash reached up to 3,000m in the air and rough weather whipped up high waves around the volcanic island.
"All flights are rerouted due to Krakatoa volcano ash on red alert," air-traffic control agency AirNav said.
No flights have yet needed to be cancelled, it said.
The Disaster mitigation agency warned of continuing ‘extreme weather’ which could result in further landslips.
"People are encouraged to remain calm and increase their awareness," agency spokesman Sutopo Purwo Nugroho said.
All activities on or near the coastline in affected areas of both West Java and South Sumatra have been banned.
