Smoke from bushfires burning hundreds of kilometres away blanketed Australia's second largest city Melbourne on Saturday, delaying flights and setting off fire alarms at the city's airport.
Water-bombing aircraft intended to help contain some of the 24 bushfires burning out of control in the southern state of Victoria were grounded because of the thick smoke. Ambulance officials urged people with respiratory problems such as asthma to stay indoors and aviation officials warned pilots that visibility was down to five kilometres (three miles).
"The conditions for today with all the smoke in the atmosphere are absolutely terrible for people with asthma. It is imperative that they stay inside," said an ambulance official. The bushfires, most sparked by lightning strikes, have blackened almost 180,000 hectares (450,000 acres) of land, mostly in rugged, inaccessible mountains in the north-east of the state.
Fire-fighters fear the fires could sweep through some small country towns in Victoria's highlands on Sunday as northerly winds pick up strength ahead of a forecast cool change.
Blazes stretching 150 kilometres (93 miles) from the central King Valley to the Victorian coast could destroy more than 600,000 hectares (1.4 million acres) in coming days as fires merge in the face of strong northerly winds, authorities have said. Scientists fear climate change will bring more frequent higher temperatures and less rainfall to the country.
Bushfires are a regular feature of Australia's summer. In January 2005, the deadliest bushfires in 22 years killed nine people in South Australia. Four people were killed and 530 homes destroyed in Canberra in 2003. That same year, bushfires fuelled by drought ravaged a slice of Australia three times the size of Britain. Over the past 40 years, more than 250 people have been killed in bushfires in Australia.