Hundreds of rescuers swarmed over twisted and smoking buildings on Wednesday in a frantic search for survivors after New Zealand's catastrophic earthquake left 75 dead and about 300 missing.
Emergency services cordoned off central Christchurch, which was devastated by Tuesday's shallow, 6.3-magnitude tremor, to hunt for anyone still alive along with an unknown number of bodies buried in the rubble.
Prime Minister John Key declared a national emergency.