At least 75 people have been killed as search for survivors continues

CHRISTCHURCH, New Zealand - The siblings huddled on Wednesday on sodden grass, staring at the smoldering remains of a building that collapsed with their mother inside.

They hadn't heard from TV presenter Donna Manning since a powerful earthquake tore through one of New Zealand's largest cities, killing at least 75 people and leaving some 300 missing in the rubble. Still, there was hope.