Bali's Ngurah Rai airport will remain closed until at least Wednesday morning local time. "The Volcanic Ash Advisory shows that the plane routes have been covered by volcanic ash, this is dangerous for the flights," Indonesian AirNav official Wisnu Darjono said. Indonesia has warned the first major eruption of Mt Agung on the tourist island of Bali is imminent, with authorities closing the airport and ordering 100,000 residents living near the volcano to evacuate the area immediately. But thousands haven't left despite authorities raising the alert to its highest level, and forcible evictions may be enforced, a spokesman for the country's National Disaster Management Agency (BNPB) said. "There are personnel doing the sweeping, if they [residents] need to be forcibly evacuated," Sutopo Purwo Nugroho said. The airport was originally closed for 24 hours from Monday morning, disrupting 445 flights and stranding about 59,000 passengers, after Mount Agung sent volcanic ash high into the sky. Officials said cancellations could be extended. "Plumes of smoke are occasionally accompanied by explosive eruptions and the sound of weak blasts that can be heard up to 12km from the peak," the Disaster Mitigation Agency said in a statement after raising the alert from three to its highest level of four. "The potential for a larger eruption is imminent," it said, referring to a visible glow of magma at Mount Agung's peak overnight and warning residents to evacuate a danger zone at a radius of 8-10km. Video footage shared by the agency showed volcanic mud flows (lahar) on the mountainside. Lahar carrying mud and large boulders can destroy houses, bridges and roads in its path. Bali airport, about 60km from the volcano, will be closed for 24 hours, its operator said. Ten alternative airports have been prepared for airlines to divert inbound flights, including in neighbouring provinces. Virgin Australia said it was cancelling flights on Tuesday, while Jetstar was offering to exchange Bali bound tickets for other destinations.
Television footage showed hundreds of holidaymakers camped inside the airport terminal, some sleeping on their bags, others using mobile telephones. Some travellers had retired for the night on makeshift beds on the terminal's dusty floors. Others were considering a more than 10-hour journey across land to the city of Surabaya to begin a string of flights across Indonesia and eventually to Australia. But all were frustrated by the lack of information from the airlines. The first Janeen McKay heard of the cancellations was a text from her brother back in Australia just before she arrived at the airport. "I had nothing from Jetstar, they had my mobile number," she told AAP. She had been waiting for nearly 12 hours and was told by the airline she couldn't get home until Saturday. Ms McKay, an office manager, said she needed to get back to Geraldton to take care of her elderly mother, while her sister, Wendy Lynch, needed to be at work as a nurse on Thursday. "We had a really nice time in Bali but then we get here and this has just ruined it," Ms McKay said. "Why does it take five days to get us out of here? "Not very happy." Veronika Naberezhnova said she was resigned to the waiting game too. "It's a bit annoying," the Department of Human Services employee said. "My family's waiting there (in Sydney) as well, they're all waiting, they're all stressed." Cover-More, Australia's biggest travel insurer, said on its website customers would only be covered if they had bought policies before the volcano alert was first issued on September 18. Indonesia's hotel and restaurant association said stranded tourists at member hotels would get one night's free stay. Mt Agung sits more than 3000 metres high over eastern Bali. Australia's Bureau of Meteorology's Volanic Ash Advisory Centre in Darwin issued maps showing an ash cloud heading southeast over the neighbouring island of Lombok away from Bali's capital Denpasar, where the international airport is located.