Some 100,000 people must evacuate from the danger zone around a rumbling volcano on the Indonesian resort island of Bali.
Officials have warned of an imminent eruption as massive columns of thick grey smoke spew from the volcano.
Some 40,000 people have already left communities near Mount Agung, but that figure is set to more than double, the disaster mitigation agency said.
The exclusion zone around Mount Agung, which is 75km from the tourist hub of Kuta, has been widened to 10km, with people living in the exclusion zone being urged to evacuate.
A senior state volcanologist said constant tremors can be felt.
Huge plumes of smoke have been pouring out of the volcano since Tuesday and experts said it was belching thick grey smoke as high as 3,400 metres.
Meanwhile, hundreds of tourists are stranded at Bali airport after Indonesia closed the airport of the holiday island after the warning for Mount Agung was raised to the top level four alert.
Bali's airport, the third busiest airport in Indonesia, was closed for 24 hours.
It has disrupted 445 flights and 59,000 customers, due to the eruption warning and the presence of volcanic ash from Agung.
Frustrated tourists swamped the airport saying that there was no information prior to the closure and they do not know when they could fly out.
Five alternative airports in neighbouring provinces have been prepared for airlines to divert inbound flights.
The Department of Foreign Affairs has said that it is aware of a number of Irish citizens in Bali and is providing consular assistance.
The Australian government has put out a travel advisory instructing travellers to exercise a high degree of caution in Indonesia and follow the instructions of authorities.
Mount Agung last erupted in 1963, killing about 1,600 people.
