LATEST: The Christchurch quake death toll rose to 113 this morning as police urged tourists to phone home so they can determine if anyone should be struck off the missing list.
Superintendent Dave Cliff said many of those on the list of 228 missing were tourists whose families were worried about their welfare.
"Please phone home, let your loved ones know where you are," he said.
Cliff said the number of dead had risen to 113 as the process of victim identification continued.
Rescue workers have begun the grim task of removing bodies from the ChristChurch Cathedral as hopes of finding any more earthquake survivors fade.
Up to 22 people are believed to have been buried in the rubble of the cathedral after the spire toppled in Tuesday's 6.3 magnitude quake.
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There is little chance of finding survivors at the flattened Pyne Gould Corporation building, where bodies were pulled from the rubble overnight.
The top two floors of the Canterbury TV building, where up to 122 people are unaccounted for, have been removed, Urban Search and Rescue spokesman Mitchell Brown said.
Inspector Mark Harrison said police had established a large liaison team to begin contacting families with missing relatives.
He said daily briefings are being held for the families with several hundred people attended yesterday's meeting.
He said some people had been reported as missing many times - up to 20 on one occasion - so it took time to work through the list.
About 600 search and rescue staff, who failed to find any survivors overnight, have been working in shifts searching the central city rubble today.
The Fire Service's Paul Baxter said about 600 Urban Search and Rescue personnel were on the ground from NZ, Queensland, NSW, Japan, UK, Taiwan and Singapore.
Preservation of life was still the first priority, he said.
Mayor Bob Parker said engineers were assessing local shopping centres and malls. The focus was on medical centres and pharmacies.
Parker said 80 teams of four people were checking properties and the welfare of the people living in them.
"We are doing everything we can to rescue people - our assumption is we will be finding people alive, we don't know if that's true but that's the process we are working to."
Civil Defence Director John Hamilton reiterated this morning there was no need for people to stockpile or "risky steps" to store petrol.
"Christchurch will not run out of petrol, or fuel. Same with food," he said.
Operational supermarkets had plenty of food with good links to supplies.
The weather had changed today with rain, not expected to ease until this afternoon, making conditions dangerous for rescue workers, one of whom had been hit by falling debris this morning.
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LITTLE CHANCE OF FINDING SURVIVORS
Ninety international students and staff from private training school King's Education are believed to be inside the flattened CTV building.
Australian and Japanese searchers are continuing to work at the site.
A number of Chinese nationals are believed to have been in class when the building was flattened, China Central Television reported on its website.
Some of those students have not responded to frantic calls or text messages sent by their relatives, CCTV said, adding police believed some of the students may have been sent to hospital.
While police had previously said there was no chance of survivors at the building, Police Superintendent Russell Gibson told Radio New Zealand Gibson they had not lost hope.
He said they were experienced searchers and had dealt with similar buildings in other quakes and survivors had been found.