Mount Sinabung, a volcano in western Indonesia, erupted on Saturday, sending hot ash far down the mountain's slopes. No injuries were reported, but more than 2,700 people have been evacuated from villages within the danger zone. The volcano has been sporadically erupting since 2010 and is among about 130 active volcanoes in Indonesia, which is prone to seismic upheaval due to its location on the Pacific 'Ring of Fire.'