Aftershocks weaken Chile's quake-damaged buildings (Videos, Pictures, Photos)

At least seven significant aftershocks shook Chile on Saturday, the largest with a preliminary magnitude of 5.1, according to the U.S. Geological Survey.

No additional damage or injuries were immediately reported, but aftershocks have dangerously weakened buildings all across the disaster zone, including a 22-story office tower whose now-exposed upper floors have partly pancacked and threaten to crash down onto downtown Concepcion. The city's mayor has announced at least five contracts for controlled demolitions of such buildings.

At least 500,000 homes were destroyed, but the figure could reach 1.5 million once surveys are complete, Housing Minister Patricia Poblete said.

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Aftershocks weaken Chile's quake-damaged buildings