*UPDATE* In the comment section, member "tomh1138" claims to have been witness to this. His comments are found below. ------ An ice-covered tree limb falling onto a power line. Captured live by WHO TV Channel 13 out of Des Moines, Iowa, on February 25, 2007. The limb fell directly onto the line, causing a series of explosions of the transformers of the grid. tomh1138's comments ----- T