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AT&T’s botched network update caused yesterday’s major wireless outage

AT&T blamed itself for "incorrect process used as we were expanding our network."

"Based on our initial review, we believe that today's outage was caused by the application and execution of an incorrect process used as we were expanding our network, not a cyber attack," AT&T said on its website last night. While "incorrect process" is a bit vague, an ABC News report that cited anonymous sources said it was a software update that went wrong. The San Francisco Fire Department said it was monitoring the outage because it appeared to be preventing "AT&T wireless customers from making and receiving any phone calls (including to 911)."

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