Three people died during a Triple Zero network outage that was the result of a network upgrade, Optus chief executive Stephen Rue has announced at a last-minute press conference.

The failure affected some 600 customers in South Australia, the Northern Territory and Western Australia, Rue said, and three people died during that period on Thursday. Two of the deaths occurred in South Australia, and one was in Western Australia.

“Our investigation is ongoing, but at this stage I can confirm that 600 customers were potentially impacted, of which a proportion of their calls did not go through,” Rue told journalists in a last-minute press conference late on Friday.

“I can confirm that this technical failure has now been rectified. I have been advised that during the process of conducting welf

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