#PM John Key: 'It's heartbreaking'
#Up to 100 feared trapped under rubble of collapsed buildings
#Second quake in five months struck closer to the surface - and during busy lunchtime period
#Famous Christchurch Cathedral destroyed
#The Queen sends message of support
Rescuers are continuing their desperate search for survivors throughout the night amid the ruins of the New Zealand city of Christchurch after a massive earthquake that killed at least 65 people.
It was the second major shock to hit the city of 350,000 in five months, although it caused far more destruction than the first.
More than 100 people are thought to still be trapped in the rubble today.
'It is just a scene of utter devastation,' said Prime Minister John Key, who arrived in the city within hours of the quake.
He said the death toll may rise, and added: 'We may well be witnessing New Zealand's darkest day.'
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