3 missing, 4 injured in 'ground-shaking' plant explosion in Illinois

Three workers are missing and four were injured after an explosion rocked a manufacturing plant outside Chicago late Friday.

Marshall Steven Lenzi said 90 percent of the main building was destroyed and there was damage, estimated at $1 million, to five buildings on the property. All of the buildings were manufacturing related.

No homes were damaged in the explosion and no civilians were hurt.