Three people have died following an Optus network upgrade that resulted in a technical failure impacting triple-0 calls in South Australia, the Northern Territory and Western Australia.

Optus chief executive Stephen Rue told reporters on Friday evening that two people died in SA and one in WA.

“Yesterday, Optus conducted a network upgrade and within this process a technical failure impacted triple-0 calls,” he said.

“This resulted in the failure of a number of triple-0 calls ... our investigation is ongoing but at this stage I can confirm that approximately 600 customers were potentially impacted, of which a proportion of their calls did not go through.

“I can confirm that this technical failure has now been rectified.

“I have been advised that during the process of conducting welfare

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