CASA GRANDE, AZ - 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.
Television images show the building was blackened around the entry door, but Rice says the damage was not extensive.
The federal Bureau of Alcohol, Tobacco, Firearms and Explosives has investigators at the scene. ATF spokesman Tom Mangan says they are just starting their work and more information will be available later Friday morning.
Casa Grande police did not immediately respond to requests for information.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
Did You Hear?
A man who was trying to protect his wife from a home run ball got a face full of beer for his effort.
Jim Heston, an American guesthouse operator in Cambodia, has lived a life in denim and has the photos to prove it. There were the dungarees he wore as a little boy, the dark bell-bottoms he had on for a hike up Japan's Mount Fuji, and the Levis straight-leg 501 jeans he's stayed with for the past 36 years.
A first edition copy of "Harry Potter and the Philosopher's Stone" that contains author J.K. Rowling's notes and original illustrations is going on sale in a charity auction.
More Casa Grande News
Authorities say a man has died after he was struck by a train in Casa Grande Friday morning.