A powerful earthquake killed at least 15 people and left 200 injured Tuesday as it rocked a swath of northern Italy hit just nine days ago. Factories, warehouses and churches collapsed, dealing a second blow to a region where thousands remained homeless from the previous, stronger temblor . The 5.8 magnitude quake left 14,000 people homeless in the Emilia Romagna region north of Bologna, one of Italy’s most agriculturally and industrially productive areas.