Authorities further extend exclusion zone after volcano sends ash and smoke more than two kilometres into the sky.

Mount Ruang, located in in North Sulawesi Province, first erupted at 9:45pm (13:45 GMT) on Tuesday sending billowing clouds of smoke and ash high into the sky.

After four more eruptions on Wednesday, Indonesia’s volcanology agency raised the alert level for the 725-metre (2,379-foot) high mountain to four, the highest on the scale.

They also widened the exclusion zone around the crater from four kilometres (2.5 miles) to six kilometres (3.7 miles).

More than 800 people were evacuated initially from Ruang to nearby Tagulandang Island, which is located more than 100 kilometres (62 miles) north of the provincial capital, Manado.

But officials said later that everyone on Tagulandang would also need to be evacuated as a result of the widening exclusion zone, and would be taken to Manado.

Officials also worry that part of the volcano could collapse into the sea and cause a tsunami as it did during a previous eruption in 1871.

Video footage showed flows of red lava streaming down the mountain, reflected in the waters below, and billowing clouds of grey ash above Ruang’s crater.

Muhammad Wafid, the head of Indonesia’s geological agency, earlier said Ruang’s initial eruption sent an ash column two kilometres (1.2 miles) into the sky, with the second eruption pushing it to 2.5 kilometres (1.6 miles).

The volcanology agency said volcanic activity had increased at Ruang after two earthquakes in recent weeks.

Indonesia, which sits along the ‘Ring of Fire’, a horseshoe-shaped series of tectonic fault lines around the Pacific Ocean, has 120 active volcanoes.

In 2018, the eruption of Indonesia’s Anak Krakatoa volcano triggered a tsunami along the coasts of Sumatra and Java after parts of the mountain fell into the ocean. Hundreds of people were killed.