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A number of Sydney residents reported their houses shaking this afternoon, but Geoscience Australia says no earth tremors have been recorded.
Tamarama resident Christine Pearce told smh.com.au: "I believe we experienced an earthquake.
"We were sitting working and the whole house shook.
BLACK Hawk helicopters loomed ominously over Sydney today as the defence forces began training ahead of the coming APEC summit.
Counter-terrorist units will carry out a number of exercises in the CBD and in skies over Sydney, including use of Black Hawk helicopters, and joint land drills with the NSW Police.
NSW Police Commander Peter Lennon said the training was an important part of security preparations for APEC.