A 200m (656 ft)-tall column of smoke was seen rising from Mt. Agung on Sunday, said the chief geologist monitoring the site, Gede Suantika.
“We observed sulphuric smoke spewing from its crater and we never saw this before,” said Suantika.
The Red Cross said more than 42,000 people have been evacuated from their homes near the volcano, while Fox News reported that nearly 50,000 people have fled the Indonesian island itself, fearing an imminent volcanic eruption.
Increased seismic activity at Agung in recent days has forced creation of a 7.5 mile (12 km) buffer zone around the mountain.
The volcano last erupted in 1963, killing more than 1,100 people.
Thanks to Dean Koehler and Sonya Porter for these links