There was a big boom at the Metrodome in Minneapolis this morning.  According to MPR News:

An Idaho demolition contractor blowed up the Metrodome real good this morning. They touched off the blast about 7:30 a.m., after closing the streets around the Metrodome and cordoning off a safety area in the neighborhood.


The explosive demolition went off without a hitch, according to Mortenson Construction vice president John Wood. The blast was meant to bring down only the upper ring of the structure, after an expected collapse as that was being demolished last week. “It was a complete success. It is laying on the ground,” Wood said. “That was mission accomplished… It went exactly as planned.”