Image copyrightGetty ImagesImage captionMount Rinjani is east of Bali on the nearby island of Lombok. The 3,726m active volcano is the third highest in Indonesia
Some flights to and from Bali have been cancelled for a second day due to a drifting ash cloud from Mt Rinjani, east of the Indonesian holiday island.
Denpasar Airport was closed on Tuesday, grounding all flights as officials reassessed the risk posed by the plume.
All Virgin Australia and Jetstar flights were cancelled on Wednesday, whilst Air Asia said at least 13 of its flights had been affected.
Travellers are urged to check their flights online.
The Bali hashtag continues to trend in Australia.
Image copyrightGetty ImagesImage captionPersistent eruptions from Indonesia's Mount Raung to the west of Bali brought bad news for travellers earlier this year
Thousands of people were stranded on Bali for several days during the peak July holiday period due to ash from a different active volcano, east of Denpasar.
At the time, Chris Davies from the Volcanic Ash Advisory Centre in Darwin in Australia's north told the BBC it does not take much ash to interfere with flights.
"The most dangerous aspect for aviation is that modern jet engines pull in so much air and the ash concentrates in engines and turns into a kind of molten glass," Mr Davies said.
"The ash melts, coats inside of the engine and affects fuel flow, so in the worst case scenario it can cause engines to shut off."
Image copyrightEPAImage captionThe haze has reached such high levels in Palangkarays in Kalimantan that it has turned the air yellow
Indonesia is preparing warships and ferries in case it needs to evacuate children affected by haze caused by the country's illegal forest fires.
Co-ordinating Security Minister Luhut Pandjaitan said an evacuation was one contingency among several others.
South-East Asia has been particularly hit hard this year by the haze, an annual occurrence.
It has caused serious health issues, particularly among those living in the epicentres Kalimantan and Sumatra.
Mr Pandjaitan said authorities had identified at least six provinces where children and babies could be evacuated, local media say, but any evacuation would depend on approval from President Joko Widodo.
Other options include moving residents to government offices equipped with air purifiers, Reuters news agency reports.
Hazy issue
Image copyrightAFP
The haze is caused by farmers clearing land for plantations for the palm oil, pulp and paper industries, primarily in the Indonesian province of Kalimantan on Borneo and the island of Sumatra.
Residents in those areas have been living with hazardous levels of smoke in the past two months.
Image copyrightAFPImage captionMilitary aircraft have been water-bombing affected areas
Indonesia has struggled to put out the fires, most of which are on peat land which burns for longer and produces more smoke than other fires.
US-based environmental research organisation World Resource Institute said earlier this week that the daily carbon emissions caused by the fires were surpassing the average emissions by the United States.
The haze has blanketed Singapore and Malaysia as well, straining diplomatic ties, and has recently drifted northwards to affect southern Thailand and the Philippines.
Image copyrightAFPImage captionThe sign reads: "If you date on the beach, the risk is on your own" - a warning against romantic relationships outside marriage
Strict laws against homosexuality have come into effect in the conservative Indonesian province of Aceh.
Gay sex between Muslim men or women, both locals and foreigners, can now be punished with 100 strokes of the cane.
The law, passed in 2014 but only now being enforced, has faced opposition by rights groups.
The strictly Muslim province has become increasingly conservative in recent years and is the only one in Indonesia allowed to implement Sharia law.
Under the new laws, adultery also carries a possible penalty of 100 strokes. Those who accuse someone of adultery without proof could themselves face 80 lashes.
Image copyrightEPAImage captionCanings often happen in public and can draw large crowds
"The law is to safeguard human dignity. It is to protect Aceh's Muslims from committing immoral acts," provincial Sharia chief Syahrizal Abbas told the AFP news agency.
But Ismail Hasani, from human rights group the Setara Institute for Democracy and Peace, criticised the law as "cruel, inhumane and against the constitution".
Gay sex is not illegal in the rest of Indonesia.
Aceh has allowed brought in its own laws ever since reaching an agreement with the national government in 2001 to end a separatist movement.
The province has recently seen a deterioration in relations between the Muslim majority and smaller religious groups such as Christians.
Churches have been destroyed in violent protests in recent weeks or have been demolished by local authorities who said they lacked proper permits.
Image copyrightEPAImage captionTension has been building in Aceh province, where authorities have begun imposing Islamic law on religious minorities
Two churches have been burned down and at least one person has been killed in clashes in Indonesia's Aceh province on Tuesday, say officials.
Report say hundreds of Muslim men attacked a church in Aceh Singkil district, setting it on fire.
A human rights group said the attackers then burnt down a second Roman Catholic church.
They then went to a third church, where a man died in clashes with Christians defending the church and the police.
Tension in Aceh has been rising amid increasing Islamic conservatism in the province and Indonesia as a whole.
Responding to the violence, Indonesia's President Joko Widodo tweeted: "Stop the violence in Aceh Singkil. Any background of violence, especially religion and belief, destroys diversity."
Last week, protesters calling themselves Aceh Youth Concerned for Islam held a demonstration demanding that what they claimed were unlicensed churches be torn down by authorities.
Image copyrightEPAImage captionPolice say the violence was brought under control and dozens of people were detainedImage copyrightEPAImage captionThe attackers demanded that churches that they said lacked permits be torn down
The local government had agreed to act, but on Tuesday tensions boiled over and the group took matters into their own hands.
"After burning the church, the mob tried to attack another church, but it turned out Christians were already at the ready," Aceh police chief Husein Hamidi told the AFP news agency, referring only to the first and third churches attacked.
"A clash occurred, and one man was killed after being shot in the head with an air rifle," he said.
It is thought that the dead man was part of the attacking group. Four people were also reportedly injured, one of them a member of the security forces.
In between those attacks, another Roman Catholic church was also burned down, according to human rights group Alliance of United North Sumatra.
Religious violence
Indonesia is the world's most populous Muslim-majority country, although it also has significant Christian, Hindu, Buddhist and Confucian minorities.
Aceh is the only province to have officially introduced Sharia law, which is increasingly being applied to non-Muslims too.
The district where Tuesday's attacks took place is a Christian enclave, though correspondents say some Christians have already left, fearing religious violence.
Another church was also burnt down in Aceh in August. And in July, a mosque was destroyed in the Christian-majority province of Papua, in eastern Indonesia, on the Islamic holy day of Eid al-Fitr.
Image copyrightGetty ImagesImage captionIn 2013, police warned Christians of possible Islamic attacks during Christmas and New Year
Image copyrightReutersImage captionChina's island-building in the South China Sea has raised the hackles of its neighbours as well as the US
China has hit back at the US in a row over marine territorial claims.
Foreign ministry spokeswoman Hua Chunying alluded to the US when she blamed "some countries" for flexing "their military muscles again and again" in the South China Sea.
Last week, US officials said they were considering sailing warships in an area around the Spratly island chain which China claims as territory.
It has sparked tit-for-tat warnings between the two powers.
China has been worrying its neighbours - and the US - by enlarging the series of tiny islands, reports the BBC's China analyst Michael Bristow.
Washington believes Beijing is constructing military facilities, designed to reinforce its disputed claim to most of the region - a major shipping zone.
China says its work is legal and needed to safeguard its sovereignty.
'Make no mistake'
The row began when US officials said they were considering sending warships inside the 12-nautical-mile zones that China claims as territory around the Spratlys.
That sparked strong words from China, with Ms Hua warning: "We will never allow any country to violate China's territorial waters and airspace in the Spratly Islands, in the name of protecting freedom of navigation and overflight."
On Tuesday, US Defence Secretary Ash Carter expressed "strong concerns" over island-building, and defended Washington's plans.
"Make no mistake, the United States will fly, sail and operate wherever international law allows, as we do around the world, and the South China Sea will not be an exception," he said at a news conference with the Australian foreign and defence ministers.
"We will do that in the time and places of our choosing," he added, according to Reuters news agency.
Disputed islands
The dispute in the South China Sea is over the sovereignty of ocean areas, and the Paracels and the Spratlys - two island chains claimed in whole or in part by a number of countries.
Alongside the fully fledged islands, there are dozens of rocky outcrops, atolls, sandbanks and reefs, such as the Scarborough Shoal.
Although largely uninhabited, the Paracels and the Spratlys may have reserves of natural resources around them.
The sea is also a major shipping route and home to fishing grounds that supply the livelihoods of people across the region.
That in turn triggered Wednesday's rebuke from China.
Asked about Mr Carter's comments, Ms Hua said: "I want to point out that some countries, in a region far from their own lands, have deployed offensive weaponry on a large scale and flexed their military muscles again and again in the South China Sea.
"This is the biggest factor in the militarisation of the South China Sea. We hope the relevant countries cease hyping up the South China Sea issue and scrupulously abide by their promises not to take a position on the territorial disputes," she said, according to Reuters.
US dilemma
The US might have mounted sea patrols in this area, but not for several years, our analyst says - and not since China began its massive building programme in the South China Sea.
A US military plane that flew near one of the islands in May was warned off - eight times.
The US now has to decide whether to send in its ships and risk confrontation, or back down and look weak, our analyst says.
Earlier this week, Vietnam criticised China's completion of two lighthouses in the South China Sea's Spratly islands, arguing they violated Vietnam's sovereignty.
Beijing maintains the lighthouses will improve navigation.
A survivor has been found in a lake two days after a helicopter crashed in Indonesia.
Fransiskus Subihardayan, 22, was found naked and weak in the volcanic Lake Toba in western Sumatra Island by rescuers.
He was reportedly clinging to floating plants in a lake. The search is continuing for four others on board.
The single-engine light Eurocopter EC-130 crashed during an hour-long flight from Samosir Island to Medan city.
The helicopter lost contact at 12:20 local time (05:20 GMT) on Sunday.
Search and rescue agency official Heronimus Guru said that Mr Subihardayan had told rescuers that all five people on board managed to jump from the helicopter as it went down.
Image copyrightGetty ImagesImage captionWater hyacinth - shown here covering a lake in Sichuan, China - is commonly found on freshwater lakes in Asia
He said all five clung to water hyacinth covering the lake, but that he had been separated from the others by currents.
"He was found very weak and immediately rushed to hospital. Maybe he can tell more when he is strong enough," another agency official, Hisar Turnip, told the BBC.
About 200 personnel are continuing to search for survivors, reports said.
It was the second recent air accident in Indonesia.
Earlier this month a DHC-6 Twin Otter plane crashed in eastern Indonesia, killing all 10 people on board.
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