Strong aftershocks rattled New Zealand's quake-devastated city of Christchurch again Monday, toppling one of the few buildings still standing downtown and sinking thousands of homes into darkness.

Bricks crashed down in the cordoned-off city center, where only workers have tread since it was devastated in February's major earthquake. About 200 people were there when the quakes struck Monday, and two were briefly trapped in a church. More than 40 people have been taken to hospitals with minor injuries from falling debris, the city council said.

All across the city, people fled buildings in panic when a 5.2-magnitude quake struck during lunchtime; just over an hour later, a 6.0 hit, according to the U.S. Geological Survey. Smaller quakes were also recorded.

Several buildings were damaged in the central city and suburbs.

Thousands of aftershocks have followed the 6.3-magnitude quake that killed 181 people on Feb. 22. That tremor and its aftershocks have been very shallow, which along with proximity to the city, have made them very destructive. Monday's temblors were six miles (10 kilometers) deep, according to the USGS.

Special Reports /

Strong Quakes Rock Shaken New Zealand City of Christchurch Again

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