New Zealand's Prime Minister has confirmed 65 people have died, following a powerful earthquake in the city of Christchurch. That number's expected to rise significantly. The magnitude 6-point-3 quake struck just after midday, causing busy office buildings to crash down in the bustling city center. Cries for help could be heard from beneath the rubble, during a desperate scramble for survivors. Rescue crews from across New Zealand and Australia are at the disaster site, where a state of emergency has been declared.