Fears over poisonous and combustible gases were preventing rescuers from entering a coal mine in New Zealand where 29 men were missing after an explosion, police said Saturday.
A specialist mine rescue team was on standby at the Pike River colliery but would not go underground until tests confirmed there had been no buildup of gases in the wake of Friday\'s blast, police commander Gary Knowles said.
There has been no contact with the men since the explosion at the remote mine and Knowles said rescuers were hoping to swing into action by Sunday, once air samples from the mine showed there was no gas.
"To date we have not had an opportunity to get underground... as the search commander I\'m not prepared to put people underground until we can prove it\'s a safe environment," he told reporters.
Reaching the miners as quickly as possible while ensuring no rescuers were hurt was "a fine balancing act", Knowles said.
Mine owners said the potential danger from explosive methane and poisonous carbon monoxide was responsible for the delay.
They continued to hold out hope the missing men were alive, although Grey District mayor Tony Kokshoorn conceded "every hour that goes by, it gets more dire".
Prime Minister John Key said every effort was being made to reach the miners, who range in age from a 17-year-old, believed to be on his first shift, to a 62-year-old.
"It\'s a difficult time for everyone but we\'re determined to get the men out alive," he said.
Key said expressions of support had poured in from around the world, including a personal email from Britain\'s Prince William saying his heart and thoughts went out to the miners.
Police said the missing miners included two Australians, two Britons and a South African.
They are thought to be only about 150 metres (500 feet) from the surface but 2.5 kilometres (1.5 miles) from the mine entrance in a tunnel that runs beneath the Paparoa mountain range to the coal seam.
Special equipment was flown in from Australia to test gas levels in the mine and Australian Prime Minister Julia Gillard said her government would meet any requests for assistance.
Gillard said there had already been one "miracle" mine rescue this year, referring to last month\'s successful retrieval of 33 men trapped underground for 69 days at a mine in Chile.
"The world has witnessed a mine disaster already this year, and a miracle when people came out alive, and so our very best wishes go to the New Zealanders as they deal with this situation," she said.
Britain also offered to help, with Foreign Secretary William Hague saying: "It is a very worrying situation and we will do our utmost to assist."
Pike River chief executive Peter Whittall said fresh air was being pumped into the mine and it was possible the miners had reached a place of safety.
"It\'s quite conceivable they are sitting around the end of an open pipe waiting and wondering why we are taking our time to get them out," he said.
However, a power outage meant the ventilation system was not working at the mine, located in an isolated area about 50 kilometres north of Greymouth on New Zealand\'s South Island.
Two miners who survived the explosion just before 4:00 pm (0300 GMT) Friday were discharged from hospital after being treated for minor injuries. They had indicated three others were making their way out, but no one appeared.
Whittall said the cause of the explosion was not known, and workers who had been in the mine earlier in the day had not reported any problems.
Kokshoorn said the rescue was difficult and could take days as the mine\'s remote location, the lack of power and poor weather complicated attempts to reach the miners.
As night fell, the monitoring of gas levels at the mine stopped although rescuers and health workers remained on standby, Sky News reported.
The tight-knit West Coast district was said to be "grief-stricken" after the accident at the mine, which was hailed as an economic boon for the region when it opened.
"You wouldn\'t believe the grief that\'s there," Kokshoorn said. "The whole town has come to a standstill. I can\'t stress to you how emotional this is."
The South Island\'s west coast was the scene of the country\'s worst mine disaster in 1896, when an underground explosion killed 65 miners at the Brunner mine.
The mine involved in Friday\'s explosion is close to the site of another disaster in 1968, when a blast killed 19 people.
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