Mount Rinjani on Lombok Island blasted ash and debris 3,500 metres into the air today, said Sutopo Purwo Nugroho, the National Disaster Mitigation Agency spokesman.
The eruption shut down flights at the Ngurah Rai international airport in Bali, about 135 kilometres from Lombok, and the Selaparang airport in Mataram, the capital of West Nusatenggara province, located on Lombok Island.
Later today, the Blimbingsari airport in Banyuwangi on the eastern end of main Java Island also was closed, the Ministry of Transportation said.
Airlines were told to avoid routes near the mountain and a decision about reopening the two airports would be made early tomorrow, said ministry spokesman Julius Barata.
More From This Section
At Bali's airport, many travelers complained about a lack of information about their delayed flights and some were sleeping on benches inside terminals.
Farms and trees around the 3,726-metre-high volcano were covered in thick gray ash, but nearby towns and villages were not in danger, Nugroho said.