27 missing after New Zealand mine blast

A gas explosion ripped through one of New Zealand's largest coal mines Friday while dozens of workers were underground. Five of them stumbled to the surface hours later, but 27 are still missing. Shortly before Friday’s blast, the electricity went out in the mine. This may have caused ventilation problems, contributing to a buildup of gas underground.

Police said there could still be pockets of explosive methane gas in the mine, and air quality tests are underway in the ventilation shaft. The power outage has complicated efforts to pump fresh air into the mine and make it safe for rescuers to enter.

Specialist teams are preparing for a rescue bid Saturday at the mine, located in rugged mountains on New Zealand's South Island.

Kelsea Brennan-Wessels reports: