Arizona Public Service confirmed the theory, which was first put forward by Phoenix Fire Arson Investigator Steve Franklin, KSAZ-TV, Phoenix, reported Tuesday.
APS said the flash, which happened early Thursday morning and was seen by viewers of the "Arizona Morning" show on KSAZ-TV, was not traced back to the breaker until an employee came forward during the weekend and told officials about a call involving a breaker opening near 35th Avenue and Cheryl.
The utility provider said power went out for some customers for only a few seconds and no equipment was damaged.
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