A has on the Indonesian island of Flores. The volcano, named Lewotobi, spewed ash 16,000m (32,000ft) into the air and prompted the Australian Government to issue a red alert for aircraft in the vicinity.

Images show 6.8 miles into the sky, causing authorities to expand the danger zone around the volcano. Those within the danger zone have been evacuated, due to pyroclastic flow risks and are being advised to "remain calm".

The country's volcanology agency said it had raised the alert level of the volcano to the most dangerous, warning of potential lava flows if it rains.

Japan's Meteorological Agency is investigating whether the eruption could spark a tsunami.

The eruption happened at 5:34pm WITA time with ash column's reaching 11,584m above sea level.

Confirming the eruption Volcano Observation Post Officer, Yohanes Kolli Sorywutun said: "There was an eruption of Mount Lewotobi Laki-laki on Tuesday, June 17, 2025, at 17:35 WITA with an observed ash column height of 10,000 m above the peak and 11,584 m above sea level."

Dramatic footage show clouds of thick ash billowing from the crater, turning the sky grey. It is not immediately clear if there have been flight disruptions.

Authorities in Indonesia said: "The public and tourists are advised not to carry out activities within a radius of 7km and the southwest-northeast sector 8 km from the eruption center."

They also advised those nearby to "remain calm and follow the directions of the local government".

This comes less than a month after Lewotobi Laki-laki, located on Flores island in eastern Indonesia, spewed volcanic ash between 2 miles to 3.4 miles high on Sunday May 18, authorities also raised the level to the most severe.

This eruption was accompanied by thick, grey ash that moved towards the west and northwest. According to the Multiplatform Application for Geohazard Mitigation and Assessment in Indonesia (MAGMA Indonesia) - part of PVMBG - the eruption registered at 44 millimeters on a seismograph and lasted for around 43 seconds.

Indonesia sits on the "Pacific Ring of Fire", an area of high seismic activity atop multiple tectonic plates.