New Delhi, June 17 -- A volcano in the eastern side of Indonesia on Tuesday spewed a massive ash tower into the sky, prompting authorities to raise an alert, officials said.

Indonesian authorities have raised the volcano's alert level to the highest to a four-tiered system. The towering ash cloud reached 11 kilometres (6.8 miles) high, according to the country's volcanology agency.

Mount Lewotobi Laki-Laki, a 1,584-metre-high twin-peaked volcano on the tourist island of Flores, erupted at 5:35 pm local time (0935 GMT), the agency said in its statement.

No reports of damage or casualties have been raised so far.

Images shared by the agency on Tuesday showed an orange ash cloud in the shape of a mushroom engulfing a nearby village.

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