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A U.S. storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark.

How do tornados form?

SOURCE AND IMAGE: ASSOCIATED PRESS

What areas were hardest hit?

1. One person killed in farm building collapse believed to be wind-related
2. More than 100 homes and businesses damaged, 25 people injured
3. One person killed; about 60 buildings damage
4. Twisters with winds above 215 km/h carve an 130-mile path toward Little Rock suburbs of Vilonia and Mayflower, killing 14 people