Indonesian authorities have ordered all flights to steer clear of the still-turbulent Anak Krakatau volcano. These satelite images show the dramatic transformation to the area after Saturday's tsunami-triggering eruption. The country's national geological agency raised the alert level to the second-highest, and set a five-kilometer exclusion zone around the island. All flights around the volcano have been rerouted. Last Saturday, a crater collapse on the volcanic island triggered a tsunami between the islands of Java and Sumatra killing at least 430 people. Indonesia is suffering its worst annual death toll from disasters in more than a decade. Our correspondent Martin Lowe travelled to Sunda Strait with the police as they try to convince people living on tiny islands to evacuate.

Aboard a police patrol boat, we're on our way to the Sunda Strait between Java and Sumatra. We're heading for an island called Sangiang. More than a hundred people live there farming and fishing.

When the tsunami struck, four islanders were killed and dozens injured by the surging waves. Most of those who survived have been evacuated; the volcano is still active, and police want the rest to leave. But they're strong-willed island folk – and say they're remaining where they are. Police have to make do with delivering supplies and giving any help that's needed.

COMMISSIONER NUNUNG SYAIFUDDIN INDONESIAN NATIONAL POLICE "I understand the people. I would like to take them off the island but there is high ground and they feel safe."

The islands are much closer to the Child of Krakatoa volcano than either Java or Sumatra, which were both ravaged when the tsunami came ashore.

MARTIN LOWE SUNDA STRAIT, INDONESIA "Police believe the islanders remain at high risk while they're here but they can't force them to leave. They've made contact and have been informed the people want to stay."

Back on Java, the mission to recover those still missing and begin to re-build has been hampered by bad weather. Roads have flooded, at times bringing aid convoys to a standstill.

With a high death-toll, thousands of homes and businesses have been reduced to matchwood. Many people have been forced into evacuation centers.

Meanwhile, the volcano continues to rumble - throwing ash and smoke into the sky, raising fears of further eruptions. Boats have been ordered to keep clear and all flights routed away.

In the Sunda Strait, patrols to the islands are now being made whenever the weather eases, evacuating the majority and reassuring those who remain that help is at hand.

Martin Lowe CGTN in the Sunda Strait, Indonesia.