Thousands more flee volcano

A volcano in Indonesia has spewed hot lava & sand into the sky in its first eruption in 400 years.

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AN Indonesian volcano has erupted for a second day, disrupting flights and sending thousands more people into temporary shelters, officials say.

Airlines were warned to avoid remote Mount Sinabung in northern Sumatra as it spewed a vast cloud of smoke and ash high into the air on Monday, after springing to life for the first time in four centuries on Sunday.

"It erupted again at 6.30am (0930 AEST) and lasted about 15 minutes. The smoke and ash reached at least 2000 metres," government volcanologist Agus Budianto said.

The eruption was bigger than on Sunday when Sinabung rumbled into action for the first time since 1600, adding its name to the list of 69 active volcanoes in the massive South-East Asian archipelago.

Aircraft were ordered to avoid the area but travellers to North Sumatra province were warned of possible delays, transport ministry spokesman Bambang Ervan said.

"It may affect flight traffic to and from the province. It all depends on the direction of the wind," he said.

Several domestic flights had to be cancelled on Sunday due to the smoke, he said.

The number of people living in temporary shelters swelled by 3000 to 21,000, disaster management official Andes Mbaga said.

Sixteen shelters have been set up to accommodate people who evacuated their villagers as ash and stones fell around the area early Sunday.

Witnesses said a strong smell of sulphur filled the air and many people fled their homes before receiving the order to evacuate.