SYDNEY • Planes have been diverted after a thick blanket of fog covered Sydney, including the Sydney Harbour Bridge and almost the whole city skyline, the Australian Broadcasting Corporation (ABC) reported yesterday.

Sydney Airport has advised travellers to check with their airlines, after a number of services were delayed or diverted. Some flights were diverted to Brisbane and Melbourne on Tuesday morning.

So far, flights to and from Singapore have not been affected.

Sydney's Transport Management Centre said at 8.20am local time yesterday that all ferries had resumed normal service, after being halted briefly due to low visibility.

"What usually happens in scenarios like this is once the sun comes up, the fog will burn," Mr David Wright of Transport Management Centre told ABC.

Sydney residents shared photos of landmarks in the city, including the Opera House and Harbour Bridge, as these disappeared from sight, the Guardian newspaper reported on its website.

The Bureau of Meteorology told residents to take care on the roads, and forecast temperatures of up to 24 deg C once the fog cleared, it said.