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'New Zealand's darkest day': Rescue operation underway after Christchurch earthquake

Iain McGregor / Reuters

A man holds a child in his arms after the earthquake struck Christchurch on Feb. 22. A 6.3 magnitude earthquake killed and trapped people beneath rubble and sparked fires and toppled buildings in New Zealand's second-biggest city of Christchurch on Tuesday.

AP

People break windows to prepare to be rescued from a high-rise building in central Christchurch on Feb. 22. A powerful earthquake collapsed buildings at the height of a busy workday Tuesday, killing and trapping dozens in one of the country's worst natural disasters.

Iain McGregor / Reuters

A man is seen after being pulled from the rubble after an earthquake in Christchurch on Feb. 22.

Mark Mitchell / AP

Rescue workers climb onto the collapsed Pyne Gould Guinness Building in central Christchurch on Feb. 22.

 Follow the latest developments here and view more images in our slideshow.