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An earthquake in northern Italy has killed at least six people and caused serious damage to buildings in several towns, local officials say. 

The magnitude-6.0 quake struck in the middle of the night, about 35km (22 miles) north of the city of Bologna.

The tremor caused "significant damage to the cultural heritage" of Emilia Romagna region, the government said.

Later on Sunday, a magnitude-5.1 aftershock hit the region, causing more buildings to collapse.        Full Read