jakarta indonesia mount agung volcano bali let puff black smoke ash small eruption prompt singapore advise citizens ready evacuate holiday island short notice amid concern big eruption authorities change alert status agung remain one level high report flight cancellations singaporeans defer non-essential travel affect areas island juncture singapore ministry foreign affairs say travel notice wednesday also ready evacuate short notice eruptions could result ash cloud could severely disrupt air travel say agung loom menacingly eastern bali height 3,000 meter 9,842 feet last erupt 1963 kill 1,000 people raze several villages indonesia nearly 130 volcanoes country many show high level activity months eruption spokesman indonesia national disaster mitigation agency say via text message phreatic eruption late tuesday black smoke reach 700 meter 2,300 ft follow fall ash gravel sand type eruptions call phreatic product rock already exist shatter violently water heat rise magma agung quickly turn steam accord blog post discovermagazine.com website disaster agency recommend activity within 6-7.5 km 3.7-4.6 miles crater say 29,245 people stay 278 evacuation camp one stage authorities put agung alert status high level four september 130,000 people leave home alert level low three oct. 29. australia leave travel advice unchanged tell citizens monitor local media report follow instructions local authorities stay outside exist exclusion zone bali famous surf beach temples attract nearly million visitors last year business slump areas around volcano since september agung volcanic tremor begin increase tourism cornerstone bali economy indonesia fourth-biggest earner foreign currency natural resources like coal palm oil small eruption bali volcano trigger singapore travel advisory