The explosion happened around 7 a.m. in a building that houses several downtown Casa Grande businesses, including the Social Security Administration at 501 N. Marshall. (Source: CBS 5 News)CASA GRANDE, AZ (AP) -
Authorities say they're investigating a small explosion that happened at the back entrance of a Social Security Administration office in a small town about 50 miles south of Phoenix.
Casa Grande Fire Marshal Barbara Rice says the explosion was reported just before 8:30 a.m. Friday and no one was injured.
The federal Bureau of Alcohol, Tobacco, Firearms and Explosives has investigators at the scene.
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