Mystery powder rains on Idaho

Power workers says the dirt created an arc across the insulators. It acts like a groundwire and shorted out the power. The power crews rerouted the power, but Tuesday morning, they'll have to fix the insulators.

What is the mystery dirt? Utah Power officials say it's salt from the Great Salt Lake. It blew in with the storm. Salt is a conductor...

We called the Department of Environmental Quality, the Health Department, various Police and Sheriff dispatch offices in surrounding counties, the Weather Service, even State Offices in Boise, everybody knows what we're talking about, but nobody knows what it is.

DEQ says it's most likely a natural occurrence, perhaps dust in the air that came down with the rain.