Police have ordered an overnight curfew after a 7.0-magnitude earthquake rocked Christchurch, New Zealand. Officials said the goal was to protect residents from falling debris in the nation's largest city, which suffered "immense" damage. Two men were injured by falling glass and parts of buildings. Strong aftershocks have followed, and gale force winds will rush through the city within the next 24 hours. New Zealand experiences thousands of quakes each year, but they rarely cause any damage.