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ISTANBUL (Reuters) - More than a thousand people in Istanbul turned to mosques, schools and other temporary shelters on Thursday after a strong earthquake rattled the Turkish metropolis a day earlier, leaving some 1.5 million buildings at risk, authorities said.

The magnitude 6.2 tremor on Wednesday sent citizens dashing from shaking homes, reviving memories of a historic quake that devastated the country's southeast two years ago - and raising anxieties about the city's lack of preparedness.