Explosion rocks dental lab

July 31, 2009 7:18:39 PM PDT
Investigators say an explosion at a Chicago dental lab severely injured its 74-year-old owner. His wife dragged him from the rubble even though she was slightly hurt herself.

The explosion happened in the 6100-block of West Belmont on Friday afternoon and damaged five other businesses.

Investigators says there were propane and oxygen tanks in the lab where something may have sparked an explosion.

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