Australians heading to Bali have been told they are unlikely to face any cancellations or delays even though airlines are on 'red notice' after Mount Sinabung, on the island of Sumatra, erupted again. The regional volcanic ash advisory center in Darwin has issued a red notice to airlines, which means eruption is underway with significant emission of ash into the atmosphere. However, a spokesperson from Jetstar told nine.com.au that flights heading to Bali are unaffected, although they will be closely monitoring the ash-clouds movement. Billowing columns of ash shot more than 5000 meters into the atmosphere, but there were no fatalities or injuries reported as areas around the crater of the volcano, located about 1900km northwest of the capital Jakarta, have been off-limits for several years due to frequent volcanic activity. Hot ash clouds traveled as far as 4900 meters southward, with the top of the cloud reaching 7276 meters high. The volcano, one of three currently erupting in Indonesia, erupted in 2010, after laying dormant for 400 years, killing two people. Another eruption in 2014 killed 16 people, while seven died in a 2016 eruption. In 2014 around 20,000 people were forced to leave homes after 220 eruptions within a week. Sutopo Purwo Nugroho, a spokesman for Indonesia's Disaster Agency, said the eruption began on Monday morning, accompanied by multiple earthquakes and showering surrounding villages with small rocks. "In five districts it became dark with a visibility of about five meters," he said in a statement. Mount Sinabung is among more than 120 active volcanoes in Indonesia, which is prone to seismic upheaval due to its location on the Pacific "Ring of Fire," an arc of volcanoes and fault lines encircling the Pacific Basin.