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Strong aftershocks hit Christchuch, New Zealand

A series of strong aftershocks from a September earthquake has rattled Christchurch in New Zealand on one of the busiest shopping days of the year.

The most powerful tremor was 4.9 magnitude and its impact was magnified by its proximity to the city centre.

Buildings were damaged, power supplies temporarily cut and a large shopping centre was evacuated.

The city of 370,000 people was hit by a 7.1-magnitude earthquake three months ago, causing widespread destruction.

Craig McCulloch reports.

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