NOGALES, Ariz. (KVOA) The FBI and the ATF are investigating an explosive device found at the Unisource Valencia Energy Plant in Nogales, Arizona.
Law enforcement officials say the device was placed on the side of a large fuel-type tank, but never exploded.
Authorities are looking for suspects and any witnesses.
The plant is an electrical substation and has about 30,000 customers in the area.
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