Indonesia’s Anak Krakatau volcano has erupted, spewing ash as high as three kilometres into the air.

The volcano island located in Indonesia’s Sunda Strait between the main Java and Sumatra islands has erupted at least seven times since late Friday, Indonesia’s Volcanology and Geological Hazard Mitigation Centre said

It was the longest eruption since the explosive collapse of the mountain caused a deadly tsunami in 2018 along the coasts of Java and Sumatra, the centre said on Saturday.

There were no casualties reported in the latest eruption and no evacuation order was issued. The nearest settlement is more than 16km away.

The centre’s closed-circuit camera showed lava flares and the volcano continuously erupting until Saturday morning.

The second-highest alert on a scale of four has remained in place since 2018. Authorities in May warned residents and tourists to stay 5km from the crater. Until then, people used to trek to the top to observe the spectacle.

Anak Krakatau, which means “child of Kratakau”, is the offspring of the famous Krakatau, whose monumental eruption in 1883 triggered a period of global cooling.