Indonesia to relocate thousands around volcano

Indonesia will permanently relocate thousands of residents from around a volcano that erupted in recent days, killing nine people after spewing fireballs and ash on homes, officials said.

Authorities raised Mount Lewotobi Laki-Laki's alert level to the highest of a four-tiered system after several eruptions since Sunday evening, telling locals and tourists to avoid a 7km radius of the crater.

More than 2,600 families living in the area around the volcano on the popular tourist island of Flores were advised to permanently relocate, the disaster mitigation agency (BNPB) said in a statement.

"The mountain cannot be moved. We must move," an agency spokesman told residents at a temporary shelter.

"We must empty the 7 km radius."

The disaster chief said the government would help locals move to a new area or to build houses on land they already own.

The decision was "one of the long-term mitigation steps" in anticipation of future eruptions, said another BNPB spokesman.

Lewotobi Laki-Laki erupted three times overnight on Monday, shooting ash 2km into the sky, before erupting again yesterday.

Residents described their horror when they realised they were in the shadow of an eruption, which they said was initially masked by adverse weather.

"I saw flames coming out and immediately fled. There were ashes and stones everywhere," said 32-year-old Hermanus Mite.

More than 10,000 people were affected, BNPB said.

There were multiple tremors and eruptions at the volcano last week, sending columns of ash between 500 and 2,000 metres into the sky several days in a row.

Laki-Laki, which means "man" in Indonesian, is twinned with a calmer volcano named after the Indonesian word for "woman".

Indonesia, a vast archipelago nation, experiences frequent eruptions due to its position on the Pacific "Ring of Fire", an area of intense volcanic and seismic activity.