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New Zealand hit by second strong quake (video)
An earthquake measuring 6.3 in magnitude has hit New Zealand's South Island, hours after an initial quake killed two people.
The new tremor struck at 13:45 local time (00:45 GMT) at a depth of 10km (6 miles), northeast of Christchurch.
A 7.5-magnitude quake, with the same depth, had hit the same area just after midnight, triggering tsunami warnings.
A large river dammed up by a landslide has now breached its banks sending a "large wall of water" downstream.
Residents around the Clarence River - one of the largest on South Island - were being urged to move immediately to higher ground.