Rescuers searched for survivors Saturday after powerful storms spawned tornadoes that killed dozens as they ripped through the South and Midwest, flattening towns and turning churches into shelters.

At least 28 people were killed: 15 in Indiana, 12 in Kentucky and one in Ohio.

Rescue workers combed through rubble overnight for dozens believed missing after the storms struck Friday, according to state and local authorities.

"This is an enormous outbreak that's going on right now across Kentucky and the south," National Weather Service meteorologist John Gordon said. "It's crazy. It's just nuts right here."