A huge dust storm -- carrying 5 million tons of dust -- swept eastern Australia and blanketed Sydney on Wednesday, causing the city to glow red, Reuters reports.
The storm interrupted international flights, and health officials urged people to stay indoors.
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Reuters reports that the dust storm has been caused by a cold front in New South Wales.
The Bureau of Meteorology said a big cold front in New South Wales caused severe thunderstorms and gale-force winds, which whipped up the dust from the inland and spread it across Australia's most populous state. Winds of more than 100 km per hour also fanned bushfires in the state.
"This is unprecedented. We are seeing earth, wind and fire together," said Dick Whitaker from The Weather Channel.