On Tuesday 7 September, Mount Sinabung erupted yet again, its biggest eruption yet since it had become active on 29 August 2010 and experts warned of more eruptions to come. Indonesia's chief vulcanologist, Surono, said It was the biggest eruption yet and the sound was heard from 8 kilometres away. The smoke was 5,000 metres in the air. Heavy rain mixed with the ash to form muddy coatings, a centimetre thick, on buildings and trees. Electricity in one village was cut off, but there were no casualties.