BBC NEWS 22nd Feb 2011, 14:14GMT:
Rescuers are toiling overnight to reach scores of people trapped under rubble after a 6.3-magnitude earthquake which killed at least 65 people.

Christchurch Mayor Bob Parker says more than 100 people are feared buried in collapsed buildings in Christchurch.

The disaster struck at a shallow depth of 5km (3.1 miles) on Tuesday lunchtime when Christchurch was at its busiest.

It is the South Island city's second quake in six months, and the country's worst natural disaster in 80 years.

Districts deluged

The mayor has declared a state of emergency and ordered the city centre's evacuation.

On a cold and wet night, emergency teams have been toiling under floodlights to reach survivors, as relatives keep vigil outside.

Rescue teams with sniffer dogs have been fanning out across Christchurch.

A series of aftershocks, some as big as magnitude 5, have rattled the stricken city of nearly 400,000 people.

Many power and telephone lines are knocked out, while burst water mains have deluged whole districts with water.

Up to 30 people were feared trapped inside the flattened Pyne Gould Guinness building, where screams have been heard from the ruins.

Students missing

Trapped under her desk inside the building, Anne Voss told a New Zealand TV station: "I rang my kids to say goodbye. It was absolutely horrible.
"My daughter was crying and I was crying because I honestly thought that was it. You know, you want to tell them you love them, don't you?"

She said she could hear other people alive in the building, and had called out to them.

The city's cathedral lost its spire, while the six-storey Canterbury TV building, which also housed an English-language school, was reduced to a smoking ruin.

A dozen Japanese students at the school have been reported missing.

Emergency shelters have been set up at the city's Hagley Park, a race course, schools and community halls.

The Red Cross has been trying to find accommodation for people sheltering outside in tents or under plastic sheeting.

Glacier smashed

New Zealand Prime Minister John Key, who held an emergency cabinet meeting before heading to the disaster zone, said: "We paid a very heavy price here. We could be looking down the barrel at New Zealand's darkest day."

Eyewitness Tania Galbraith: "The whole building began to shake and it just wouldn't stop"

The military has been deployed to help the rescue effort, and the government has accepted an offer of specialist help from Australia.

In the aftermath of the disaster, shocked survivors wandered streets strewn with debris, including shattered glass, broken computers and desks.

Roads split and cracked open as the ground beneath was liquefied by the quake.

Helicopters plucked survivors to safety from rooftops, and dumped water on fires.


'War zone'

Bystanders used bare hands to try to free survivors trapped under debris.
Many injured people were carried out on blood-soaked stretchers or in the arms of shocked workmates and strangers.

Some escaped on ropes lowered from office towers. Others managed to crawl out of the rubble.

One Christchurch resident, Jaydn Katene, told the New Zealand Herald: "We've had friends in town call us and say there are lots of dead bodies outside shops just lying there just covered in bricks."

Police said that the dead included people on two buses which were crushed by falling buildings.

John Gurr, a camera technician, told Reuters news agency the area was "like a war zone".


'Utterly shocked'

The quake caused some 30m tons of ice to shear away from New Zealand's biggest glacier.

Witnesses say massive icebergs formed when the Tasman Glacier in Aoraki/Mount Cook National Park broke, creating huge waves.

Britain's Queen Elizabeth II, who is also New Zealand's head of state, said in a statement she had been "utterly shocked" by the news.

"My thoughts are with all those who have been affected by this dreadful event," the statement said.

The damage is thought to be far worse than after the 7.1-magnitude quake on 4 September, which left two people seriously injured but no fatalities.

The epicentre of that quake, which occurred in the middle of the night, was further away from the city and deeper underground.

New Zealand experiences more than 14,000 earthquakes a year, of which only around 20 have a magnitude in excess of 5.0.

The last fatal earthquake was in 1968, when a 7.1-magnitude tremor killed three people on the South Island's western coast.

Tuesday's was the country's worst natural disaster since a 1931 quake in the Hawke's Bay on the North Island which killed 256 people.