Rescuers have worked through the night to reach people trapped in the rubble left by a powerful earthquake that struck one of New Zealand's largest cities.
Some screamed from inside collapsed buildings. One woman used her mobile phone to call her children to say goodbye, while others tapped on the rubble to communicate with those on the outside.
Search teams used dogs, heavy cranes and earth movers in Christchurch, trying frantically to pull away crumbled concrete, twisted metal and huge mounds of brick.
Prime minister John Key said at least 75 people have died in the quake and 300 are missing.
Christchurch Superintendent Russell Gibson said: "There are bodies littering the streets, they are trapped in cars, crushed under rubble and where they are clearly deceased our focus ... has turned to the living. We are getting texts and tapping sounds from some of these buildings and that's where our focus is."
Asked how many may still be trapped, Gibson said: "It could be another hundred - it could be more."
"We've been pulling 20 or 30 people out of (two) buildings right throughout the night" where it was known people were trapped, he told National Radio. At least another dozen collapsed commercial buildings were also being searched for survivors.
Medical workers brought the injured to a triage centre set up in a park in central Christchurch, while military units patrolled near-empty streets disfigured by the huge cracks and canyons created in Tuesday's 6.3-magnitude quake, the second powerful shock to hit the city in five months.
A more powerful 7.1 magnitude earthquake hit Christchurch, a city of 350,000, on September 4, but caused no deaths.